Petrified Wood, Geodes, Crystals, Agates and Carvings

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Item Description

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$125.00 PR400b  This is an exceptional Zyamara Agate set from Madagascar with great color, amazing banding and a very unique design.  As a whole Agate it measures 6 1/2" x 4 1/4" x 3 1/4" thick and has been highly polished on the face here at the Rock Shed.  This pretty agate is a beautiful work of nature and has great characteristics especially when held in the bright light.

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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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Zyamara Agate Set

$120.00 PR401c  This is something very different; a pretty Free Form carved from Orange Calcite. This nicely polished piece measures 3 7/8" wide x 11 3/8" tall with a great polish.  It has a deep Orange/Rust color scheme with neat inclusions and some subtle "rainbow" reflections all in a very nice design. This unique item would make a great it would make a great gift or nice addition to any polished rock collection.

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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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Orange Calcite

$80.00 PR402c  Here is something different at the Rock Shed.  This is an above average quality Poly Chrome Jasper Flame.  The Poly Chrome has been highly polished on all sides except the bottom to show the gorgeous variety of colors. It measures 3 7/8" x 3 1/4" x 7 1/8" tall.  Very nice!

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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.

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Poly Chrome Jasper Flame

$14.00 PR403b  Here is something different for any collector.  Here is a very nice, very pretty Selenite Crystal from Mexico.  This Selenite is also known as Fishtail or Angel's Wing Selenite.  It measures 4 1/8" x 2 3/4" x 1 1/2" thick and has a natural shiny appearance. A great conversation piece.

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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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Selenite Crystal

$50.00

PR404b  Here's a cool new item, a fascinating Rainbow Rhyolite Cube. This neat cube measures 2 1/2" square and is not polished. It has a great shape and mesmerizing design. Very nice!

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Rhyolite is an igneous, volcanic rock that is composed of Felsic, or Silicate minerals such as Silica, Aluminum, Sodium and Potassium. This material, also called Volcanic Tuft and Rainbow Rock actually began as volcanic ash spewed from the mouth of a volcano millions of years ago. This ash was exposed to heat and pressure that resulted in turning it to stone. The bright banded colors are a result of exposure to high concentrations of iron oxides. The material is similar to that of Granite, Pumice and Obsidian but due to the cooling process when formed, Rhyolite did not form any crystals, thus changing the texture of the material.

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Rainbow Rhyolite Cube

$55.00 PR405c  This is a very nice, above average quality Black Zebra Marble Vase. It measures 4 1/8" in diameter x 9 5/8" tall. It has a nice different Black and White colors with lighter accents and is highly polished all around except for the bottom.  It makes for a very interesting display piece or would make a nice gift.

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Marble is a metamorphic rock consisting of Limestone but composed mostly of Calcite.  It is used extensively for sculpture, building materials and has many decorative uses.  The pure white Marble is probably the most common form known, but the characteristic swirls and veins of many colored Marble varieties are usually due to various mineral impurities such as Clay, Silt, Sand, Iron Oxides or Chert.

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Zebra Marble Vase

$85.00 PR406b   Here is something different from the gift department at the Rock Shed.  This is a very nice specimen of Septarian shaped into a bowl.  This extraordinary specimen has a good color mix with nice Yellow Calcite crystal and plenty of Brown Aragonite. It measures 5 3/4" wide x 2 3/8" tall and weighs nearly 2 1/2 pounds.  It has a very nice polished finish on the entire piece bringing out the wonderful character.  A perfect gift for that perfect person.

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Septarian, also know as a type of Concretion, is a volume of sedimentary rock in which a mineral cement fills the porosity.  Concretions are often ovoid or spherical in shape.  They form within layers of sedimentary strata that has already been deposited.  It is composed of a Carbonate mineral such as Calcite, a Silica such as Chert, Flint or Jasper or an Iron Oxide such as Goethite or Hematite.  It is commonly found in Shale, Siltstones and Sandstones.

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Septarian Bowl

$65.00

PR407c  Here's a unique treasure! This is a lovely high quality Amethyst Crystal Point. This fantastic piece has gorgeous Purple Amethyst in a neat shape. It has great clarity, fabulous inclusions and wonderful appearance. It measures approximately 6 3/8" x  1 1/8"  x  1 3/8".  The bottom point is slightly chipped and this has been reflected in the reduced price. Grab this beauty quick!

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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.

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Amethyst Crystal Point

$185.00 PR408c  Here is something different for the polished rock collector.  The very detailed and exceptional Brazilian Agate Skull exhibits a nice array of Agate banding, open crystal cavity all  in a fabulous design.  It measures 4" long x 2 5/8" wide x 3 1/8" tall.  A very nice piece and would make a super gift for a special person!

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Click here to view more Skull carvings!

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 Skull

$55.00

PR409b  This is a very pretty, above average quality Agate Flame from Madagascar. This very cool specimen has a pastel bluish grey and white color with lots of contrasting accents in a fabulous design. This beautiful item measures 3 1/2" x 2 3/4" wide x 5 5/8" tall and weighs nearly 2 1/2 pounds. Very nice!

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Agates mostly occur as nodules in volcanic rocks or waters containing silica in solution 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.

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Agate Flame

$285.00 PR410c  This is a great find!!  Here is an exceptional Eagle carved from gorgeous Fancy Jasper.  It has a captivating mix of colors all in an interesting design to provide unbelievable character to the appearance.  It measures 4 5/8" long x 2 5/8" wide x 5 1/8" tall and has a very nice polish.  This awesome specimen makes a great decoration as well as being a great gift.  Very cool!

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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.

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Fancy Jasper Eagle

$85.00 PR411b   Here is a very different item here at the Rock Shed.  This is a pretty Woodworthia Petrified Wood specimen from Zimbabwe.  This gorgeous piece measures over 5 1/4" x almost 3 3/8" x 3 1/4" tall and has been highly polished on the top end to show the lovely colors it is made of.   The sides are left natural showing the rough bark and how this material had seeds coming out of the bark.  This piece was cut and polished in our own Lapidary department.  A very unique and beautiful addition to any rock collection. 

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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

$20.00

PR413b  This is a beautiful natural Copper slab from from the Keweenaw Peninsula of Upper Michigan.  The beautiful specimen has been smoothed, highly polished on the top surface and then covered with a clear coat to show the gorgeous natural Copper color.  The lovely piece measures 2 1/2" x  1 3/4" x 3/8" thick.  Very cool indeed!

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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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Michigan Copper Slab

$135.00 PR414c  Here's a cool new item, a gorgeous Madagascar Jasper Obelisk. It has a fabulous array of colors in a wonderful design. It has a good polish and measures 3" x 2 1/4" x 11 1/4" tall.  A truly one-of-a-kind item so grab it quick!

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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.

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 Madagascar Jasper Obelisk

$45.00 PR415b   This is a gorgeous specimen of Petrified Wood from Madagascar.   It has a beautiful dark Red colors accented by Browns, Orange and Cream on different sides or areas with a fantastic design.  This awesome piece is highly polished and measures nearly 3 3/8" x 2 3/8" wide x 4 1/4" tall .  The exceptional polish brings out the wonderful character of the wood showing the true beauty.

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Click here to view more Petrified Wood specimens!

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

$30.00 PR416c   Here is an amazing item!  This is a beautiful polished Malachite from Zimbabwe, Africa. It has a good mix of the different green Malachite colors in the various swirls. It measures approximately 2 7/8" x 2 1/4" x  2 5/8" and has a nice polish. A really nice piece!

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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

$45.00 PR420b   Here is an excellent example of top quality Fluorite from Madagascar. This brilliant specimen has a gorgeous deep Emerald Green color loaded with very cool "cubed" shape crystals.  It  measures 5 1/2" x 2" x 2 1/2" not been polished. It also will fluoresce a bluish purple under a SW/UV light.  Just plain wonderful!!

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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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