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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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$80.00 |
M201c
Here's something new, a very cool specimen of Siderite
Chalcopyrite. It measures
3 1/2" x
3 1/4" x 1 3/4" and has a very unique natural exterior. It has
lots of sparkle and great color. An
interesting, one of a kind specimen for your mineral collection.
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Siderite is a mineral composed of iron(II) carbonate (FeCO3). It
takes its name from the Greek word σίδηρος sideros, "iron". It is a
valuable iron mineral, since it is 48% iron and contains no sulfur or
phosphorus.
Chalcopyrite is a copper iron sulfide mineral that crystallizes in
the tetragonal system. Chalcopyrite has a brassy to golden yellow color,
which often resembles Gold. However, its physical properties such as
streak and tenacity are very different from Gold and can easily
distinguish it. Chalcopyrite is a beautiful mineral, with good crystals
being fairly common. Chalcopyrite is rarely found in association with
native copper.
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Siderite Chalcopyrite
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$24.00 |
M202c
Here is something very different; an exceptional specimen of Titanium
coated Quartz crystals from Brazil. 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 3 7/8" x 2 1/8" x
1 3/4". 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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$90.00 |
M203c
This is an
exceptional specimen with bright yellow Sulfur crystals. It
measures 5 1/2" x 3 7/8" x 3" 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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$85.00 |
M204c
Here's a fascinating new item, a very beautiful specimen of Dioptase.
It has beautiful smaller dedicate crystals exploding in all directions
that gives it an exquisite appearance. It measures 2" x 1 1/4" x
7/8". It is absolutely amazing.
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Dioptase is an intense emerald-green to bluish-green copper
cyclosilicate mineral. It is transparent to translucent. Dioptase is an
uncommon mineral found mostly in desert regions where it forms as a
secondary mineral in the oxidized zone of copper sulfide mineral deposits.
However, the process of its formation is not simple, the oxidation of
copper sulfides should be insufficient to crystallize dioptase as silica
is normally minutely soluble in water except at highly alkaline pH. The
oxidation of sulfides will generate highly acidic fluids rich in sulfuric
acid that should suppress silica solubility. However, in dry climates and
with enough time, especially in areas of a mineral deposit where acids are
buffered by carbonate, minute quantities of silica may react with
dissolved copper forming dioptase and chrysocolla.
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Dioptase
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$60.00 |
M205c
This is 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. There is matrix rock visible in
some areas of the specimen. It measures 4 1/2" x 4 1/8" x 1
7/8" thick and weighs over 2 pounds.
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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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$30.00 |
M206b
This is a very nice
Galena specimen with lots of character and design. It measures 1 3/4" x 1
5/8" x
1 1/2" 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
nearly 1 pound.
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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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$30.00 |
M207c
This nicely polished Septarian Slab is from Utah. It measures
6 5/8" x
4 3/8" x 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 and even some "rainbow" reflections
in the crystal. 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 |
M208c
Here is a gorgeous specimen of Malachite from
Africa. The Malachite measures 3 1/2" x 2
3/4" x 1 1/4" 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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$25.00 |
M209b
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 5 3/8" x 3 3/4" x 1 1/2" 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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$55.00 |
M211b
Here is a very nice Dog Tooth Calcite Crystal. It measures
8 7/8"
x almost 4 1/4" x 2 1/2" 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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$75.00 |
M212c
Here is something very
different at the Rock Shed. This is a high quality specimen of
Fluorite in a matrix from China. The pretty Aqua Green Fluorite crystals
of various sizes are scattered about the matrix.
The lovely specimen measures almost 3 5/8" x
nearly 2 7/8" x almost 2 1/8" 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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$22.00 |
M213b
Here is an outstanding and interesting combination specimen of Silicon
Carbide. This unique mineral has well defined dark Crystals of different
sizes in opposite sides with a sparkly Green, Blue and Purple sheen in the light
that changes from different directions. It measures 7 1/2" x 2
1/4" x
2" and has an all natural texture and finish. It is very
difficult to capture the full brilliance of the diverse colors but it is
very colorful and sparkly. This is a one-of-a-kind mineral for the one-of-a-kind mineral collector
and 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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$50.00 |
M214b Here is a
rather unique find at the Rock Shed. This is a high quality
Rutilated Smoky Quartz Crystal. It measures 2 7/8" x 1 5/8" x
1 3/8" and has
good polish. Besides having an awesome shape it has a multitude of
visible Rutiles. Hold it up to the light and behold the sparkle of the
Rutiles. 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.
Rutile is a mineral composed primarily of Titanium Dioxide.
Rutile has among the highest refractive indices of any known mineral and
also exhibits high dispersion. Rutile is known to contain up to 10% Iron
as well as significant amounts of Niobium and Tantalum. Rutile creates
small needles within crystals that can be seen when held up to light.
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Rutilated Smoky Quartz
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$30.00 |
M215b
Here is something very different! This is a lovely
specimen of Thomsonite on a matrix. It has a pretty
beige color. This
rarer specimen measures
2 7/8" x 1 3/4" x 3/4". 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.
Stilbite is another Silicate mineral from the Zeolite family.
It is often characterized by its sheaf like aggregates. The color is
usually white or pink and when the cleavage is perfect, will have a
distinct pearly luster.
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Thomsonite
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$12.00 |
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 1 3/4" x 1 3/8" x 1 1/2" and has
different shades of pretty green colors in different areas. 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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$70.00 |
M217c Here
is a exceptionally nice Green Epidote specimen from
Brazil. It has very nice Green Epidote crystals of different
sizes and pointing in all different directions. This very interesting and
pretty specimen measures 4 1/2" x 3" x 1 3/4" tall. Very
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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.
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Epidote
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$10.00 |
M218c 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 1 1/2" x 1 1/4" x 1" 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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$35.00 |
M219b
This is a very different and pretty specimen of a gorgeous vibrant Blue
Cavansite Crystal on matrix. This unique and rare specimen measures 2" x
1 3/4" x 1 5/8" thick and would be a good addition to any
collection. This material is from Pune, India. Very nice.
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Cavansite is a deep blue hydrous calcium vanadium phyllosilicate
mineral, occurring as a secondary mineral in variety of zeolite minerals.
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Cavansite
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$20.00 |
M220b
This is a unique mineral specimen of Fluorite with Pyrite from The Minerva
Mine #1 in Harden County, Illinois. This lovely specimen measures 2 1/2"
x 1 1/2" x 1/8 . Very nice!
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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 - Pyrite
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$35.00 |
M252b
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 4 1/8" x 2 5/8"
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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