Petrified Wood, Geodes, Crystals, Agates and Carvings

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Item Description

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$14.00

PR700c  Here is a very nice, above average quality Black and White Marble Massage/Healing stone.  It measures 2 1/2" x almost 2 1/2" x nearly 1 3/4" and has a nice polish.  The specimen has a rounded design that fits comfortably in your hand to use for massage.  You may just want to use it as a paper weight or conversation piece.  It is truly beautiful and has a great polish.

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Marble is a metamorphic rock consisting of Limestone but mostly composed 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.

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Marble Massage Stone

$50.00 PR701b  This is a very pretty, above average quality, multi-colored Brazilian Agate.  This cool specimen measures 3 1/8" x 2 5/8" x 1 3/4" and has a nice polish on one side.  It has a great design, various beautiful Tan, Grey and Reddish Brown colors and a nice cavity that goes all the way through.  It makes for a very interesting display piece or would make a nice gift.

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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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Brazilian Agate

$125.00 PR702b  Here is a fabulous Petrified Wood Free Form from Madagascar.  It has an awesome array of colors ranging from reds to tan and gray in a wonderful design from any any angle or direction..  It measures almost 4 1/2" at the widest x nearly 3 7/8" x 5 3/4" tall and has been nicely polished on all sides except the bottom.  Close inspection shows some healed fractures, common for this material.  A very 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 Free Form

$24.00 PR703c   This is a very nice specimen of a Nebraska Chalcedony or often called Nebraska Blue Agate from western Nebraska.  It has nice rich blue and dark grey to black Earth Tone colors and a neat natural texture on the unpolished surfaces.  It exhibits a bright Green under short wave UV light.  The pretty agate measures 4 1/8" x 3 1/2" x almost 1 3/4" and has a smooth highly polished face.  Nebraska Blue Agates are no longer available from where they were originally found.  This wonderful example was cut and polished in our own lapidary department.  This beautiful Blue Agate is unique and would enhance any table or desk top and would be a cool gift!

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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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Nebraska Blue Agate

$75.00 PR704c  Here is something rare and different for the polished rock collector.  This is a very nice, above average quality Dry Head Agate from Montana.  This Agate has a very nice agate design and beautiful blend of Earth tone colors.  The beautiful Dry Head Agate has gorgeous tight banding on different sides.  It measures 3 1/8" x almost 3 1/8" x 2 3/4" thick with a nice polish on all sides.  Definitely a keeper. 

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Dry Head Agates are from the Bighorn Canyon area of Montana. The banding colors are usually bright orange with some white or pink bands on charcoal, light gray, whitish oranges or greenish matrix. Dry Head Agates are very rare and no longer available as the mining area is now part of a wild horse refuge. Dry Head Agates may be geologically similar to the Teepee Canyon and Fairburn Agates of the Black Hills area.

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Dry Head Agate

$40.00 PR705c  This is an amazing Carnelian Free Form from Madagascar with lots of character unique to this material.  This very cool item has darker background colors with Creamy accents and has an excellent design on each side of it.  Look at all the different views as each has character all it's own.  Close inspection shows some healed fractures, common for Carnelian.  This beautiful Free Form measures 3 3/4" x 2 7/8" x nearly 1 7/8" and weighs almost one pound.  A great addition to any collection or a super nice 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

$16.00

PR706b  Here is a very nice, unique Pakistani Onyx hand crafted bowl.  It measures 5" in diameter and 1 1/2" approximately deep with a nice polish on all sides of the bowl.  Each bowl is different and has its own beautiful design and color scheme.  Although the photo shows 3 bowls, you will received one (1) of our choice as it comes from the box.

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Onyx is a banded variety of Calcite.  The colors of its bands range from white to almost every color except shades of purple, blue and black.  It is used for vases, bowls, beads, cabochons and other items.  This type of Onyx is found in Mexico and Pakistan.  It is often carved, polished and sold in a variety of different things. 

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Pakistani Onyx Bowl

$30.00 PR707b   Here is something different from the gift shop at the Rock Shed.  This is a very nice, excellent quality Mexican Coconut Geode half.  The inside reveals nice sparkly light purple tinted Quartz Crystals in the middle of the very pretty center cavity.   The face where the geode was cut open is highly polished.  It measures 5" x almost 4 7/8" x over 2" thick with a natural, rough texture on the outside.  Very beautiful indeed.

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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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Mexican Coconut Geode

$65.00 PR708b   Here is something very special for a polished rock collector.  This is a gorgeous Labradorite Free Form.  This lovely specimen has a good color mix with a highly iridescent "blue gold" shine that changes as the light hits it from different angles.  It measures nearly 5 1/8" x over 2" thick x nearly 5" tall with a very good polish on all sides.  An exceptional item that cannot be duplicated!

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Labradorite is a Feldspar mineral that occurs in large Crystal masses in Anorthosite and shows an iridescence or "play of colors."  Gemstone varieties of Labradorite exhibiting a high degree of iridescence are Spectrolite, Moonstone and Sunstone.  High quality samples with good iridescent qualities are desired for jewelry.

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Labradorite

$25.00 PR709b   Here is something different from the gift department at the Rock Shed.  This is a very nice oval shaped specimen of Dendrite from China.  It measures nearly 3 5/8" wide x 3 3/4" tall including the base with the slab being 1/4" thick and the base over 3/4" thick.  It has a very nice polished finish on the entire piece including the base bringing out the wonderful character.  A perfect gift for that perfect person.

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Dendrites are branched or tree like inclusions, usually manganese or iron oxides that are caused by irreversible aggregation of small particles forming large cluster. It has only been in recent years that researchers have begun to understand how dendrites form and these ideas were developed by chemists and mathematicians working in disciplines called chaos and fractal geometry. Colloidal-sized particles move in random paths in a phenomenon called Brownian motion.

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Dendrite

$100.00 PR710c   This is a very nice polished Free Form made from a Septarian Nodule.  This particularly nice Septarian has lots of Brown Aragonite with lovely contrasting Yellow Calcite crystals in the fantastic center cavity with openings on the different sides.   It measures almost 3" wide x 2 1/4" x nearly 3 1/2" tall and weighs almost 1 1/2  pounds.  Septarian nodules, especially nice ones like this are rather difficult to find now, so grab this one while you have the chance.

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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 Free Form

$240.00 PR711c  Here is something different from the gift department at the Rock Shed.  This is a larger, very lovely display cut from a large Brazilian Agate.  The item has a gorgeous crystal cavity with awesome Amethyst crystals.  It measures over 6 7/8" tall x nearly 4 5/8" wide x over 2 1/8" thick and has a good polish on the face. The piece does have a small area where the crystals are dinged at the lower right but still is incredibly beautiful.  A perfect gift for that perfect person.

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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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Brazilian Agate w/ Amethyst

$120.00 PR712c  Here is an amazing item!  This is a very beautiful, above average quality, Smokey Quartz Crystal.  The larger Crystal has good clarity throughout with sparkly inclusions and lots of tiny rutiles on the "landscape".  The lovely Crystal has very nice facets and a good polish.  The awesome Smokey Quartz crystal measures nearly 4 3/4" x almost 2 7/8" x 1 1/2".  Quartz crystals usually don't photograph well and this very nice example is no exception.  A cool gift or just keep it for yourself.

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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

$45.00 PR713c  This is a beautiful Vase made from Chinese Marble.  This is a multi-colored vase with a nice blend of Creamy Yellow, various Greens, Brown and Greys.  It measures  over 3 3/4" in diameter x almost 8" tall, weighs nearly 3 3/4 pounds and is nicely polished except for the very bottom.  A very nice addition to any polished collection or it would make a great gift.

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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.

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Peacock Marble Vase

$40.00 PR715b  This is a unique Vase made from Chinese Marble.  This multi-colored vase has a nice blend of Burnt Sienna, Cream, Green, Grey and dark Green with a nicely polished finish except for the bottom.  It measures nearly 6 3/4" tall x 3/8" in diameter and weighs over 2 1/4 pounds.  A very nice addition to any polished collection or it would make a great gift.

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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.

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Marble Vase

$70.00 PR716c  Here is a different and amazing item!  This is a very beautiful  Chevron Amethyst standup.  The lovely standup has awesome purple Amethyst color in areas with the distinctive Chevron design and a good polish.  The awesome specimen measures 3 1/4" x 3 1/8" x 5" tall.  A perfect gift for that perfect person.

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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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Chevron Amethyst

$8.00 PR718b   Here is a very different item here at the Rock Shed.  Here is a very nicely polished piece of Orange Calcite from Mexico.  It measures nearly 1 5/8" x 1 3/4" x 2  1/2" tall.  This lovely piece has real pretty Bright Orange colors with lighter streaks for accents.  It would make a nice addition to any mineral or polished rock collection.  A cool gift or just keep it for yourself.

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This is a similar to like item as they are all very close to appearance and size.

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

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