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Cost
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Item
Description
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$25.00 |
M200b
This is a very nice Barite and Calcite combination specimen on a matrix.
This very cool specimen has well defined dark Honey Golden colored Barite Crystals
mixed in with the matrix. The lovely Barite crystal on one side is
almost 2" long
and the specimen overall measures 1" x almost 1" x over
1 1/8" and has a nice natural appearance.
The tip of the large crystal is not perfect and is reflected in our price. This interesting specimen is from Meade County of South Dakota.
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Barite is a mineral consisting of Barium sulfate and is generally white
or colorless. It is used in the manufacture of paints and paper.
Although Barite contains a 'heavy' metal, Barium, it is not considered to
be a toxic chemical because of its extreme insolubility.
Calcite is a Carbonate mineral that is most widely distributed on the Earth's
surface. It is a common constituent of sedimentary rocks with Limestone
in particular. A Calcite formation can take on many different shapes
and sizes which is dependent on the location, ground water occurrence and
temperature. Calcite is usually white or colorless but can be gray,
red, yellow, green, blue, violet, brown or black. The deeper the color
is usually indicative of the definitive impurities from the earth or water. |
South Dakota Barite
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$45.00 |
M201c
Here is something very different; a nice specimen of Chabazite in matrix from Table Mountain, Colorado. This specimen we
purchased from an old collection has
several shaded Peach
colored Chabazite in the sparkly cavities. It measures over 3 3/8" x
2 7/8" x nearly 2 1/4" and has a very unique, natural exterior. An
interesting, one of a kind specimen for your mineral collection.
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Chabazite, also known as acadialite, is one of the lesser known
Zeolites. Chabazite forms in the petrified bubbles (called vesicles) of
volcanic rocks that have had a slight amount metamorphism. Chabazite
occurs also in and around hot springs as a precipitate but does not form
the wonderful crystals that collectors know from such places as Poona,
India. The typical crystal of chabazite is a rhombohedron. A rhombohedron
is basically a "squashed" cube. Chabazite occurs most commonly in voids
and amygdules in basaltic rocks. |
Chabazite
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$18.00 |
M202c
Here is something very different; a nice specimen of Titanium
coated Quartz crystals. In an interesting fusion of science and
nature using a process called magnetron ionization, a brilliant iridescent
titanium coating covers the lovely Quartz producing a spectacular piece.
The shiny multi-colored specimen measures almost 2 1/2" x nearly 1
3/4" x 1
7/8" tall. Very cool! Another photo
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Quartz is the second most common mineral in the Earth's continental
crust. It is mainly composed of Silica or Silica based minerals.
Although Quartz is known by a variety of names, the most important distinction
between types of Quartz is that of macro-crystalline, individual crystals
visible to the unaided eye, and micro-crystalline, where aggregates of crystals
are only visible under high magnification. There are many forms of Quartz
including Chalcedony, Amethyst, Citrine, and Carnelian which are results of
mineral impurities or heat treatments. |
Titanium Quartz
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$26.00 |
M203c
This is a beautiful specimen with bright yellow Sulfur crystals. It
measures nearly 4 1/4" x almost 2 3/4" x 2 3/4" and has not been polished.
This excellent Sulfur specimen has very nicely defined and sparkly crystals. This
material is from Durango, Mexico.
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Crystals of Sulfur are usually yellow to yellowish-brown blocky dipyramids.
Also it is found more typically as powdery yellow coatings. Native Sulphur
is usually formed from volcanic action - as a sublimate from volcanic gasses
associated with Realgar, cinnabar and other minerals. It is found in
some vein deposits as an alteration product of sulfide minerals.
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Sulfur
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$20.00 |
M204c
Here is a nice specimen of Fluorite from China. It has a
beautiful range of Dark Purple to lighter Purple Fluorite crystals with
nearly clear on the bottom of the specimen.
It measures almost 1 1/2" x 1 5/8" x nearly 1 1/4". It
has some dings in it but is still absolutely amazing.
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Fluorite, also referred to as fluor-spar, is a mineral composed of Calcium
Fluoride. It is a widely occurring mineral found world wide and is often
found with metallic minerals such as Galena, Sphalerite, Barite, Quartz
and Calcite. Fluorite may fluoresce strongly in ultraviolet light
which may be due to the presence of some impurities such as Yttrium.
Blue is the most common color but red, purple, green, yellow and white are
also frequent. It can be used in high performance telescopes, camera
lens, enamels and in the making of opalescent glass.
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Fluorite
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$28.00 |
M205b
This is a nice specimen of natural Copper
in Quartz from Adams County, Pennsylvania. It is the natural native copper
just as it formed in the rock. It measures 3" x
2 1/4" x almost 2 1/4"; weighs over 1 1/8 pounds and has a natural unpolished exterior to show
the lovely dark copper color.
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Click
here to view more Copper specimens !!
Copper is a reddish colored metal with a high electrical and thermal
conductivity. It has its characteristic color because it reflects red
and orange light and absorbs other frequencies in the visible spectrum due
to its band structure. It is in the same family as Silver and Gold and
is a malleable metal. It is beautiful natural or polished.
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Natural
Copper
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$45.00 |
M206c
This is a very nice
Galena specimen with lots of character and design. It measures
nearly 2 3/4" x over 1 7/8" x almost 1 3/8" and has a natural shiny
appearance. The Galena has Calcite crystals on it as well. The mineral is quite heavy for it's size as it falls
into the heavy metal category of minerals. This very cool specimen weighs
almost 3/4 pounds.
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Galena is the natural mineral form of Lead Sulfide. It is the
most important Lead ore mineral and is one of the most abundant and widely
distributed sulfide minerals. It is often associated with Sphalerite,
Calcite and Fluorite. Galena deposits often contain significant amounts
of Silver, Zinc, Cadmium, Antimony Arsenic and Bismuth. It is used as
a semiconductor in early wireless communication systems. It is usually
dark grey to black in color with a shiny iridescence.
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Galena
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$45.00 |
M207b
This nicely polished Septarian Slab is from Utah. It measures
nearly 7 1/8" x 6 3/4" x over 1/2" thick and has been nicely polished on the
front face. This Septarian Nodule slab has beautiful Yellow Calcite
bordered with pretty brown Aragonite. A definite beauty to behold.
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Here to See More Septarian Specimens.
Septarians are commonly composed of a carbonate mineral such as Calcite,
a microcrystalline form of Silica as in Flint or Jasper, or an Iron Oxide
such as Hematite. These specimens are also known as a concretion which
is a type of sedimentary rock.
Septarians were formed millions of years ago by sediment forming around
a fossil to create a mud ball transforming the fossil into Calcite and Aragonite.
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Septarian Slab
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$40.00 |
M208b
Here is a gorgeous specimen of
Malachite on matrix from the Milpillas Mine in Sonara, Mexico. This
mine is no longer open to mineral collectors. The lovely specimen
has plush velvety green crystals covering parts of the top like a carpet.
The Malachite measures almost 2 1/4" x nearly 1 5/8" x 1
1/8" and
is unpolished or altered. The unsurpassed example has lots of personality
with distinctive natural beauty!
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Malachite is a Copper Carbonate mineral that often forms botryoidal,
fibrous or stalagmitic masses. It is often the result of the
weathering of Copper Ores and is commonly found with Azurite, Goethite and
Calcite. It is typically associated with Copper deposits including
Limestone which is the source of the Carbonate. Malachite is found
in many regions world wide and is usually shaded green in color.
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Malachite
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$20.00 |
M209c
Here is an outstanding specimen of Apophyllite Crystals. This
beauty is a one of a kind, very well defined specimen with the sparkly
nearly clear Apophyllite crystals that will not be duplicated. It measures
almost 4 3/8" x nearly 2 3/4" x 1 3/4" and has a natural sparkly finish. This
material is from Jalgaon, India. Just very nice!!
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Apophyllite, a Zeolite, is Silicate mineral with very well defined clear
Crystals and is very popular as a collector's mineral. The Crystal structure
will refract like in obvious rainbows and can form "natural pyramids" when
tumbled.
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Apophyllite
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$40.00 |
M210c
This is a nice Smokey Quartz cluster specimen with multiple tips of
various different sizes. It measures almost 5 3/8" x
2 5/8" x over 2 1/8" and has a pretty sparkly appearance.
Most of the tips are very nice but there are some broken crystals, typical
for this material.
This beautiful specimen is from Brazil. Very, very
nice!
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Quartz is the second most common mineral in the Earth's continental
crust. It is mainly composed of Silica or Silica based minerals.
Although Quartz is known by a variety of names, the most important distinction
between types of Quartz is that of macro-crystalline, individual crystals
visible to the unaided eye, and micro-crystalline, where aggregates of crystals
are only visible under high magnification. There are many forms of Quartz
including Chalcedony, Amethyst, Citrine, and Carnelian which are results of
mineral impurities or heat treatments.
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Smokey Quartz
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$75.00 |
M211c
Here is a very nice Dog Tooth Calcite Crystal. It measures
8"
x almost 4 3/4" x 3 1/4" and has an all natural exterior. This
specimen has many sharply pointed Crystal points with Pinkish Brown tinted pyramid-shaped centers
and an iridescent shine. There are also tiny clear crystals on much
of it that provides a "frosted" look. A super gift.
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Calcite is a Carbonate mineral that is most widely distributed on the Earth's
surface. It is a common constituent of sedimentary rocks with Limestone
in particular. A Calcite formation can take on many different shapes
and sizes which is dependent on the location, ground water occurrence and
temperature. Calcite is usually white or colorless but can be gray,
red, yellow, green, blue, violet, brown or black. The deeper the color
is usually indicative of the definitive impurities from the earth or water.
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Dog Tooth Calcite
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$30.00 |
M212b
Here is something very
different at the Rock Shed. This is a high quality specimen of
Fluorite in a matrix. The pretty Purple and Aqua Blue Fluorite crystals
are scattered about the matrix and more concentrated on the bottom.
The lovely specimen measures almost 5" x
3 3/8" x nearly 2 1/2" and has its own natural shine in areas. This all
natural mineral has an unique character and makes a great addition to your
collection.
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Fluorite, also referred to as fluor-spar, is a mineral composed of Calcium
Fluoride. It is a widely occurring mineral found world wide and is often
found with metallic minerals such as Galena, Sphalerite, Barite, Quartz
and Calcite. Fluorite may fluoresce strongly in ultraviolet light
which may be due to the presence of some impurities such as Yttrium.
Blue is the most common color but red, purple, green, yellow and white are
also frequent. It can be used in high performance telescopes, camera
lens, enamels and in the making of opalescent glass.
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Fluorite
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$14.00 |
M213c
Here is a very nice interesting combination specimen of Silicon Carbide.
It measures 3 1/2" x 3" x over 2" and has a natural texture and finish.
This mineral has well defined dark Crystals with a sparkly Green and
Purple sheen in the light that changes from different directions.
Something very different!
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Silicon carbide, also known as carborundum, is a compound of silicon
and carbon and occurs naturally as ultra rare moissanite. Silicon
carbide powder has been mass-produced since 1893 for use as an abrasive.
Grains of silicon carbide can be bonded together by sintering to form very
hard ceramics widely used in applications requiring high endurance, like
as car brakes or ceramic plates in bulletproof vests. Electronic
applications of silicon carbide as light emitting diodes and detectors
began over 100 years ago and continue today are widely used in
high-temperature/high-voltage semiconductor electronics. Large single
crystals of silicon carbide can be grown by the Lely method; they can be
cut into gems known as "synthetic moissanite".
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Silicon Carbide
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$20.00 |
M214c Here is a
rather unique find at the Rock Shed. This is a high quality specimen
of rough Hematite in matrix. It measures 3 3/8" x nearly 2 3/8" x 1
5/8" and has
its own natural shine in areas. This mineral has an unique bubbly, botryoidal
design and rich color. Nice!
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Hematite is a mineral form of Iron oxide. It is a very common
material that has a black to steel to silver-grey color and may also appear
reddish brown. Hematite is a heavy metal and when it is polished it
is consider to many to be of gemstone quality. It is very popular in
jewelry and Native American art.
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Hematite
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$45.00 |
M215b
Here is something very different! This is a lovely
specimen of Thomsonite with some very nice sphericules on a matrix
including another Zeolite, Stilbite. It
has a pretty beige color with the large spherical being 1 1/2" in diameter. This
rarer specimen measures
3 3/8" x nearly 2 3/4" x 2 1/8". This very interesting piece comes
from India and would complete any serious collection.
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Thomsonite is an uncommon and desirable member of the Zeolite group,
forming in unique and interesting crystal aggregates. Thomsonite was
first identified in material from Scotland in 1820 and is named for the
Scottish chemist Thomas Thomson. The crystals tend to be long thin
blades that typically form radial aggregates, and sometimes fans and
tufts. The aggregates are variable and may be spikey in appearance, dense
and ball-like, or form worm-like growths. Tight acicular radiating
clusters and sphericules are common forms.
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Thomsonite
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$100.00 |
M216c Here is something different for the mineral collector. This is
a very nice specimen of Wavellite crystals in matrix and is from Arkansas. This
interesting mineral measures almost 6 3/8"
x 4 1/4" x almost 3 1/4" and has different shades of pretty green colors
in different areas. Close inspection shows the signature radiating "starburst"
characteristics of this material. A really different
mineral for the mineral collector. Very cool!
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Chemically, Wavellite is Hydrated Aluminum Phosphate Hydroxide.
It is a secondary mineral found most often in aluminous, low-grade metamorphic
rocks. Normally it forms as radiating "starburst" clusters of green to yellow-green
crystals. It will show its fibrous structure on fracture surfaces in the matrix.
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Wavellite
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$55.00 |
M217c Here
is a exceptionally nice Green Epidote with Quartz specimen from
Brazil. It has very nice Green Epidote crystals that are mixed
in with the numerous sparkly Quartz crystals of different sizes and
pointing in all different directions. This very interesting and
pretty specimen measures almost 3 3/4" x 2 3/8" x 2" tall. Very
nice. Another photo
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Epidote is an abundant rock-forming mineral, but one of the
secondary origin. Many of the characters of the mineral vary with the
amount of iron present. Prismatic, columnar crystals, often shiny, finely
striated faces. The color is green, gray, brown or nearly black but
usually a characteristic shade of yellowish-green or pistachio green.
Quartz is the second most common mineral in the Earth's continental
crust. It is mainly composed of Silica or Silica based minerals.
Although Quartz is known by a variety of names, the most important distinction
between types of Quartz is that of macro-crystalline, individual crystals
visible to the unaided eye, and micro-crystalline, where aggregates of crystals
are only visible under high magnification. There are many forms of Quartz
including Chalcedony, Amethyst, Citrine, and Carnelian which are results of
mineral impurities or heat treatments.
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Epidote - Quartz
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$20.00 |
M218b Here
is a new and different item at the Rock Shed. This a very nice, very
interesting Rosasite and Limonite specimen from Mapimi, Mexico. It has a
very pretty Aqua blue Rosasite on the Limonite matrix. This fantastic
mineral measures 4 1/4" x almost 1 7/8" x nearly 1 7/8" and has a super natural
appearance. A great way to begin your mineral collection!!
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Rosasite is an uncommon mineral belonging to the Carbonate group of
minerals. It has a minor potential for use as zinc or copper ore as is
typically associated with Copper deposits including Limestone which is the
source of the Carbonate.
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Rosasite
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$14.00 |
M219c
Here is an interesting and rare mineral. This is a nice sized, very
colorful Purpurite specimen from an unknown location. This
compelling specimen has an unique design with the rich Purple color of the
Purpurite in several areas accented by an interesting shape. It
measures almost 2" x 1 3/4" x 1 3/8" and has a natural finish. Very
nice.
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Purpurite is a rare mineral, basically Manganese Phosphate although
with varying amounts of iron depending upon the source of the mineral,
It is a striking pink purple color as be expected of a manganese
containing mineral. Purpurite never forms crystals but is only found
in masses and forms a series with the iron bearing end-member heterosite.
Purpurite is named after Latin "purpura" - purple, referring to
it's color.
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Purpurite
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$140.00 |
M220b
This is a unique and rarer mineral specimen of Green Fluorite with clear
Selenite blades from Mongolia.
Most of the nearly clear and sparkly Green Fluorite crystals have excellent
clarity providing a magnifying effect to the attached Selenite blade matrix. The
clear Selenite blade crystals are very colorless or pure with amazing
character. This lovely specimen measures nearly 5 1/4" x 3 3/4" x 2
1/4 tall.
Just absolutely gorgeous!
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Fluorite, also referred to as fluor-spar, is a mineral composed of Calcium
Fluoride. It is a widely occurring mineral found world wide and is often
found with metallic minerals such as Galena, Sphalerite, Barite, Quartz
and Calcite. Fluorite may fluoresce strongly in ultraviolet light
which may be due to the presence of some impurities such as Yttrium.
Blue is the most common color but red, purple, green, yellow and white are
also frequent. It can be used in high performance telescopes, camera
lens, enamels and in the making of opalescent glass.
Selenite, also known as Satin Spar, Desert Rose and Gypsum Flower, are
the four Crystalline varieties of Gypsum. It is a very soft material
composed of Calcium Sulfate. Selenite is often transparent and colorless.
If color is present it is often due to impurities or presence of other minerals.
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Green Fluorite - Selenite
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$40.00 |
M252c
A nice specimen of natural Copper from Keweenaw Peninsula, Michigan. This
is natural native copper which has been mostly removed from the matrix
rock which was surrounding it. It measures 3 3/4" x over 2 1/2"
x 1 3/4" thick; weighs nearly 1 1/4 pounds and has a natural rough exterior.
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Click
here to view more Copper specimens !!
Copper is a reddish colored metal with a high electrical and thermal
conductivity. It has its characteristic color because it reflects red
and orange light and absorbs other frequencies in the visible spectrum due
to its band structure. It is in the same family as Silver and Gold and
is a malleable metal. It is beautiful natural or polished.
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Copper
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