Petrified Wood, Geodes, Crystals, Agates and Carvings

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$225.00 PR500b  This is a very cool larger,  very pretty Brazilian Agate slab.  The agate slab has fantastic banding in shades of blue, grey, brown, rusty yellow surrounding a lighter colored center. The irregular shaped slab measures almost 13 1/4" wide x 9" x almost 1 1/2" thick and weighs 8 pounds.  This gorgeous agate slab also has rough natural edging and an unpolished back.  A stunning piece that would look fabulous mounted on a wall, window, or propped up with a stand on a shelf.  Just beautiful!

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Agates mostly occur as nodules in volcanic rocks or waters containing Silica in solution which is possibly derived from the decomposition of Silicates in the lava.  The Siliceous matter is deposited in regular layers resulting in the banded or striped formation.  It is very unlikely that you would ever find an exact duplicate of any type of Agate, Brazilian or other.

brazilian agate

Brazilian Agate

$25.00 PR501b  This is a nice larger Petrified Wood specimen from Arizona.  This lovely Petrified Wood specimen has rich Grey, Red, and Brown with other colors mixed in with an unique design.  It measures 6 3/8" x nearly 4 5/8" x almost 1" thick and has been nicely polished on one side.  It has been cut and polished in the Rock Shed's own Lapidary department. The specimen has cracks or fractures that are common for Petrified Wood material. A truly beautiful piece of polished Wood.

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Petrified Wood is a type of a fossil as it consists of fossil wood where all the organic materials have been replaced with minerals while retaining the original structure of the wood.  These minerals are most often Silicates such as Quartz.  Other minerals, Manganese, Iron and Copper, in the water or mud during the petrification process give Petrified Wood a variety of color ranges: black - Carbon; green/blue - Copper; red/brown/yellow - Iron.  Petrified Wood can preserve the original structure of the wood in all its detail all the way down to the microscopic level.  Structures such as tree rings and the various tissues are often observed features.  Although Petrified Wood can be found worldwide, it is rather rare in larger quantities and at times can be difficult to obtain by the average collector.

polished rock

Petrified Wood

$70.00 PR502c  Here is a very beautiful, above average quality, single terminated Quartz Crystal from Brazil.  The large Crystal measures 6 7/8" x nearly 3 3/4" x almost 2 7/8" and has a good clear appearance near the tip with some interesting inclusions.  The Crystal has very nice facets and a good finish.  There are some minor dings in the edges and are reflected in our price.  An excellent large Crystal for any collection.

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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.

quartz crystal

Crystal Quartz

$30.00 PR503b  This is an above average quality Rose Quartz Free Form from Brazil.  This gorgeous Rose Quartz has a lovely rose Pink color with lighter accents.  It has lots of character with sparkly inclusions and a great polish.  It measures almost 2 5/8" wide x 2 1/8" x nearly 4 1/8" tall .  A very nice piece indeed!

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Rose Quartz is a type of Quartz which exhibits a pale pink to rose red hue.  The color is usually considered as due to trace amounts of Titanium, Iron or Manganese, in the massive material.  Some Rose Quartz contains microscopic Rutile needles which produce an asterism in transmitted light.

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Rose Quartz

$35.00 PR508b  Here is a excellent example of Blue Calcite from Mexico.  It has many very nice calcite crystals, of various Blue colors with lighter accents and red streaks in places.  It measures 8 1/2" x 3 3/4" x 4 1/2"; weighs almost 5 1/2 pounds and has a sparkly polished appearance.  A true wonder of nature.

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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.

polished rock

Blue Calcite

$45.00 PR505b   Here is a very nice, above average quality vase made from Peacock Marble from China.  It measures almost 3 5/8" in diameter x 8" tall and has a nice exterior polish.  This vase has an unique design which exhibits several colors and designs in different areas of the vase.  Definitely a one-of-a-kind treasure.

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Click here to view more Vases from Marble or other materials!

Peacock Marble is from Southwest China and formed in Limestone by heat and pressure in the earth's crust. Recrystallization during Himalaya formation caused the limestone to change in texture and makeup. Fossilized materials along with it's original carbonate minerals, recrystallized and formed large, coarse grains of calcite. Impurities present in the limestone during the recrystallization affected the mineral composition of the marble.  The minerals that result from the impurities give the marble up to ten different colors. The corresponding colors and minerals that can be found: Green - Serpentine; Purple - Manganese spar; Brown - Iron; Gray - Silicon Dioxide; Red - Hematite; Orange - Iron; White - Calcite; Violet - Iron Manganese; Yellow - Limonite; Blue - Copper, Cobalt, Chromium; Black - Carbon, Iron, Manganese. Peacock Marble is also called "seven color Jade" in local language.

marble vase

Marble Vase

$65.00 PR506c  Here is an amazing discovery!  This is a Sikhote-Alin Meteorite from Primorskiy Kray, Russia that fell on Feb 12, 1947.  It measures 1 1/2" x 3/4" x almost 3/8", weighs 20.7 grams and has a natural sheen on the Black metallic finish.   These Meteorites are special in that they have "finger print" marks on the surface which are the result of the melting of the material upon entering the atmosphere from outer space. A cool gift or just keep it for yourself.

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A Meteorite is a natural object originating in outer space that survives an impact with the Earth's surface without being destroyed.  There are 3 types of meteorites: stony, which are mainly composed of Silicate minerals; Iron, which are largely composed of metallic Iron-Nickel; and stony-Iron, which are composed of both types of media.

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Sikhote-Alin Meteorite

$165.00 PR507b   This is an enormous and very nice Dugway Geode from Utah and from an old collection we recently purchased.  The inside of the lovely irregular cavity is lined a variety of different textures from fine druzy Quartz Crystals with a pale gray to nearly clear color to pale pink and clear crystals.  The awesome Dugway Geode has an all natural finish and measures approximately 9 1/4" wide 9 1/2" x 7" and weighs over 14 3/4 pounds.  A must have for the collector or an excellent gift for someone! 

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Geodes are geological rock formations which occur in sedimentary and certain volcanic rocks.  They are essentially rock cavities or vugs with internal Crystal formations or concentric banding.  The exterior is generally Limestone while the interior contains Quartz Crystals and/or Chalcedony deposits.  If the Geode is completely filled with Crystal, being solid all the way through, it is then called a nodule.

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Dugway Geode

$50.00 PR514c  This is a piece of pretty multi-colored Rainbow Calcite.  It measures over 6 1/4" x nearly 4 1/8" x almost 7"; weighs over 8 pounds and has a nice polish.  The Rainbow Calcite has a nice light Peach, Raspberry, Green colors with Cream, White and nearly clear sparkly accents.  A true beauty.

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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.

polished rock

Rainbow Calcite

$24.00 PR516c  This is a lovely specimen made from Pink Opal from Peru.  The beautiful piece has a nice Pink colors with cream and Black accents and a good polish on the cut face.    It measures almost 6" x nearly 2 3/8" x2 1/4".   A great gift or keep it for yourself!

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Opal is a colorful mineral of hydrated form of Silica related to Quartz. It's internal structure makes it diffract light, taking on many colors depending on the conditions when it was formed. Those colors can range from clear through white, red, orange, yellow, green, blue, purple, rose, pink, brown and black. Opal varies in optical density from opaque to semi-transparent. Opal is the national gemstone of Australia, a producer of over 93% of the world's supply.

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Pink Opal

$80.00 PR509b  Here is something new at the Rock Shed. This is a very nice, above average quality Brazilian Agate slab.  It measures 10" wide x 5 3/8" and nearly 1 1/8" thick with a nice high polish on the face.  The beautiful Agate slab has a lovely blue-grey center and two cool crystallized center cavities with sparkly accents.  Very nice!

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Agates mostly occur as nodules in volcanic rocks or waters containing Silica in solution which is possibly derived from the decomposition of Silicates in the lava.  The Siliceous matter is deposited in regular layers resulting in the banded or striped formation.  It is very unlikely that you would ever find an exact duplicate of any type of Agate, Brazilian or other.

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Brazilian Agate

$225.00 PR517b  Here is something different from the gift department at the Rock Shed.  This is a very cool Petrified Wood slab with a fully functional bowl carved into the top.  The Madagascar Petrified Wood is highly polished on the top side with it's amazing colors and design unique to petrified wood.  The sides are left natural and have a rugged texture only adding to it's wonderful character.  This lovely piece measures over 10" x almost 8 1/2" x 2" thick and weighs over 9 pounds.  A perfect gift for that perfect person.

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Petrified Wood is a type of a fossil as it consists of fossil wood where all the organic materials have been replaced with minerals while retaining the original structure of the wood.  These minerals are most often Silicates such as Quartz.  Other minerals, Manganese, Iron and Copper, in the water or mud during the petrification process give Petrified Wood a variety of color ranges: black - Carbon; green/blue - Copper; red/brown/yellow - Iron.  Petrified Wood can preserve the original structure of the wood in all its detail all the way down to the microscopic level.  Structures such as tree rings and the various tissues are often observed features.  Although Petrified Wood can be found worldwide, it is rather rare in larger quantities and at times can be difficult to obtain by the average collector.

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Petrified Wood Bowl

$45.00 PR510b   This is a large polished Slab from a Septarian Nodule.  This gorgeous slab has a very pretty Yellow Calcite center with contrasting Brown Aragonite all in an interesting design.  It measures 8 1/8" wide x nearly 6 7/8" over 5/8" thick and an excellent polish on the face.  An outstanding Septarian slab!

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Click Here to See More Septarian Specimens like this

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.

polished rock

Septarian Slab

$60.00 PR511b   Here is a beautiful polished piece of Poly Chrome Jasper.  This free form measures  nearly 3 1/4" wide x 2 5/8" x 5 1/8" tall and is highly polished on all sides except for the bottom.  This interesting specimen has a nice blend of a couple Orange accents with Dark Green and Brown colors on a Dark Cream background all in a nice design.   A lovely addition to any collection.

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Jasper, or spotted stone, is an opaque, impure variety of Quartz that is usually red, yellow or brown in color.  Some Jaspers simultaneously exhibit several variants such as banding, flow patterns, dendrites or color variations.  This results in what appears to be scenes or images in a cut section of the Jasper.

polished rock

Poly Chrome Jasper

$90.00 PR513b  This is a lovely piece of high quality Purple Amethyst with a very nice crystal cavity that goes completely through.  It measures approximately 7" x over 4 1/4" x 4 1/2" and has a super nice appearance.  This beautiful cluster has very good, intact points and a very pretty soft Purple color. Very, very cool!

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Click here to view more Amethyst specimens!

Amethyst is a purple variety of Quartz often used as an ornament.  It occurs in color from a light, slightly pinkish violet to a deep grape purple.  Upon exposure to heat, Amethyst generally becomes yellow, which some refer to as Citrine or "burnt" Amethyst.  It is widely distributed as a mineral, but fine, clear specimens that are suitable for cutting as ornamental stones.

amethyst free form

Amethyst

$100.00

PR512c  This is something different from the Rock Shed.  Here is a very nice, above average quality, rose and lavender colored Petrified Wood Limb Cast from Texas Springs, Nevada.  This large piece measures 5 3/4" long x nearly 4 1/4" x almost 3 3/8" and is polished on one face.  This is an extremely nice specimen and will complete any Petrified Wood collection.

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Click here to view more Limb Casts!

A limb cast is a psuedomorph where the original wood has been replaced by chalcedony. These pieces form when a tree was buried by ash. The wood is burned away by the hot ash and a "cast" is left. Minerals in the groundwater then permeated the cast, replacing the original organic matter and turning it to stone. The result is a rock that has the form of a tree limb. Some of these casts show the bark and wood textures. Pink and green limb casts are highly prized by collectors.

polished rock

Petrified Wood Limb Cast

$48.00 PR515c  Here is very pretty Carnelian carved into a free form from Madagascar.  It measures nearly 3 7/8" x 2 3/8" x nearly 5 1/2" tall has a nice polish.  It has a nice soft mix of colors including dark Cream, burnt Orange and dark Reds, a nice crystal cavity; all in a lovely design unique to Carnelian.  Close inspection shows some healed fractures, common for Carnelian.  This beautiful piece makes an nice display and would make an excellent gift.

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Carnelian is a red or reddish-brown variant of Chalcedony but also may come in the colors of orange and pink.  It is quite common and usually found in translucent pebble form.  It is found in several areas of Europe, Iceland and Madagascar.

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Carnelian

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