Tumbled Stone Identification
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Grossularite Garnet
The grossularite garnet used to make tumbled stones, beads and carvings is an opaque, massive garnet
Hematite
Hematite is an iron oxide mineral with a bright red or silver color. It is has a specific gravity that is about double that of the typical gemstone - thus it feels very heavy. This hematite has a bright silver metallic luster. These hematite used to produce these stones was found in Brazil.
Hypersthene
Hypersthene is a black silicate mineral occasionally found in igneous rocks such as gabbro, basalt and andesite.
Jet
Jet is an organic rock similar to coal, but instead of breaking like coal it can be cut, carved or polished into interesting sculptures
Kambamba Jasper
Kambamba Jasper is a dark green orbicular jasper that takes a nice polish and is found in Madagascar. The Kambamba jasper shown here was found in the Betsileo region of Madagascar.
Labradorite
Labradorite is a variety of plagioclase feldspar that often exhibits bright flashes of electric yellow, green or blue when played in the light.
Lake Superior Agate
Lake Superior Agates are banded chalcedony nodules that formed in the gas vesicles of ancient Canadian lava flows. Glaciers carried these nodules to the shores of Lake Superior, where they were deposited.
Lapis Lazuli
Lapis Lazuli is a gemstone that has been popular since Biblical times. It is one of just a few blue gemstones.
Leopard Skin
Leopard Skin looks like its name. It is a cream to tan to pink rhyolite with black, white, red, or tan markings in a color pattern that resembles a leopard's skin.
Magnesite
Magnesite is a magnesium carbonate mineral. It usually has a white or gray color and is sometimes marked with gray to black veins. It is porous and its white color allows it to accept dye with very predictable color results. It is often confused with Howlite.
Magnesite - Dyed Magnesite is one of the most commonly dyed lapidary materials. It is often dyed to produce bright colors that are not often found in natural stones. It is also used as a substitute for turquoise. These are sometimes sold without disclosure.
Mahogany Obsidian
Mahogany Obsidian is a rare variety of obsidian (a natural volcanic glass) that gets its name from its brown color. It ranges from a "black obsidian with brown markings" to a solid brown material. It accepts a very bright polish and is very popular because of that polish.
Malachite
Malachite is a green copper carbonate mineral. It often displays swirled and banded patterns in shades of light through dark green. It is a very heavy material because of its high copper content. These stones were produced from malachite mined in Zaire (Africa).
Montana Moss Agate
Montana Moss is a transparent to translucent agate with brown and black mossy inclusions. The base color ranges from clear through milky to amber brown. It is named after the State of Montana where it is found at many locations and is a popular rough with lapidaries.
Mookaite
Mookaite is a banded jasper that is found in Australia. It is characterized by its bright orange and black bands. Mookaite is a popular material for jewelry and decorative items.
Amazonite is a green microcline feldspar. It is named after the Amazon River of South America.
Apache Tears are round nodules of obsidian that polish to a beautiful jet black color. If you hold them up to the light, you will see a rainbow of colors
Apricot Agate is a banded agate that is named for its apricot pink or orange color. It is a beautiful material with bands of white to clear quartz.
Amethyst is the name given to transparent to translucent purple quartz. It often forms in alternating bands with white to clear quartz. The resulting material is called Banded Amethyst or sometimes Chevron Amethyst.
Carnelian is a translucent orange to red or brown agate. It often forms in alternating bands with white chalcedony. The result is known as Banded Carnelian.
Moonstone occurs in a wide variety of colors, including black and dark gray. The black to gray bodycolor is visible from most directions, but the moonstone effect is only visible when the stone is tilted.
Tumbled Stone Identification
Blue Gemstones
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Black TourmalineTourmaline has one of the widest color ranges of any gem. |
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BloodstoneBloodstone, also known as heliotrope, is a green jasper splashed with small drops of red. |
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Blue BerylBeryl is a mineral that occurs in a blue color. Transparent blue beryl is the very popular gemstone known as "aquamarine". When it is translucent to opaque the name "blue beryl" is most appropriate. |
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Blue ChalcedonyThe variety of microcrystalline quartz known as chalcedony occurs in a blue color, such as this blue material mined in Namibia (Africa). |
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Blue Lace AgateBlue Lace Agate is the name given to a chalcedony that consists of alternating bands of white agate and subtle blue to blue-green. |
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Blue QuartziteBlue quartzite is a metamorphosed sandstone that receives its color from tiny blue inclusions of a fibrous mineral that is probably dumortierite. The abundance of the inclusions causes color variation within the stone and some intense blue bands where the inclusions are most abundant. |
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Botswana AgateBotswana Agate is a name given to a banded agate found in Botswana (Africa). Botswana agate typically has wonderful white, gray and brown banding - sometimes with "eyes" - and takes a very high polish. |
Brecciated Jasper
"Breccia" is a rock composed of angular fragments.
Carnelian Agate
Carnelian Agate is a translucent orange to red or brown agate.
Chrysocolla in Quartz
Chrysocolla is a vivid blue to blue-green mineral that contains copper.
Cinnabrite
Cinnabrite is a rock composed of scapolite (white) and epidote (red).
Citrine Quartz
Citrine is a variety of transparent to translucent quartz that ranges in color from a light yellow through orange to brown.
Citron Magnesite
Citron Magnesite is a pale green to bright green magnesium carbonate with a color similar to ripening citrus fruit.
Clear Quartz
Quartz is one of the most abundant minerals in Earth's crust but clear specimens with very little color and nearly free from inclusions are highly prized.
Colored Moonstone
Moonstone is a variety of feldspar that is characterized by its chatoyancy, or the ability to display adularescence, a milky blue or white sheen.
Confusionite
Confusionite is a material that, at least to the observer, is difficult or impossible to identify. No person who possesses an abundant number of stones would ever mistake a piece of confusionite for anything else.
Coral, Agatized
A rare find is fossil coral that has been replaced by agate - or agatized. This type of fossilization often preserves the structure of the coral.
Crackle Quartz
"Crackle Quartz" is a name used for quartz specimens that have been heat treated and then dyed to change their color.
Crazy Lace Agate
Crazy Lace Agate is a white to gray botryoidal agate with colorful stains that are usually yellow, orange, red and brown.
Dalmatian Stone
Dalmatian Stone is white to gray igneous rock with black spots. It is given that name because white specimens resemble the coat of a Dalmatian dog.
Dolomite
Dolomite is a sedimentary rock that is very similar to limestone. Most people would never think of it as a gemstone.
Dumortierite
Dumortierite is a bright blue, dark blue or greenish-blue mineral that is occasionally found in metamorphic rocks. It can be polished to a high shine.
Dyed Agate
Agate is a variety of chalcedony that can be extremely colorful. It is slightly porous, with some bands and zones being more porous than others.
Eye Agate
"Eye agates" are rare agates that have perfectly circular markings or "eyes". These are actually three-dimensional features. Botswana agates frequently display eyes.
Fluorite
Fluorite occurs in a variety of colors such as purple, green, yellow, blue and clear - that are often banded. It often has a wonderful fluorescence. Although it is beautiful it is not well suited for jewelry use because it has a hardness of four and has perfect cleavage in four directions.
Gneiss
Gneiss is a metamorphic rock in the shale - slate - phyllite - schist - gneiss sequence. It usually contains an abundance of feldspar minerals.
Goldstone
Goldstone is a man-made glass that contains abundant crystals with a bright metallic luster. Flat faces of the crystals catch and reflect light.
Granite
Granite is an igneous rock composed of quartz and feldspar with minor amounts of micas, amphiboles and other minerals. It can be pink, gray, black, or white.
Green Aventurine
Aventurine is a translucent quartz with inclusions of platy minerals such as muscovite mica, hematite or goethite.
Green Jasper
The most common jasper color is red and after that in abundance is green jasper. It is often a very very dark green.
Green Moss Agate
Green moss agate is a type of agate that is characterized by its green color and moss-like patterns. It is a popular gemstone for jewelry and other decorative items.
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Ocean Jasper
Ocean Jasper, sometimes called "orbicular jasper," is a silicified rhyolite or tuff that contains "eyes" formed from radial quartz and feldspar crystals. It occurs in a variety of colors, but green, yellow, white, pink and cream color patterns are very common. It often has an amazing fluorescence. Shop for Ocean Jasper
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Oil Shale
Most people think of a sticky, gooey rock when they hear the name "oil shale." However, it is often silicified enough that it can be polished in a rock tumbler to produce beautiful banded tumbled stones with subtle shades of gray, brown, tan and green. Shop for Oil Shale
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Olive Opal
Olive opal is a color variety of common opal with a greenish yellow or yellowish green to black color. It can be translucent to opaque and translucent pieces often have a resinous appearance that reminds you of a greenish amber. Shop for Olive Opal
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Orange Quartz
Quartz naturally occurs in almost every color of the spectrum. These colors are caused by impurities in the quartz crystal. This gemmy orange quartz in a beautiful "peach" color was produced from a mine in India. Shop for Orange Quartz
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Orthoclase
Orthoclase is a very common mineral of the feldspar family. It often has a pleasing peach color and soft pearly luster. Surprisingly orthoclase has not received the same level of lapidary attention as amazonite - another feldspar mineral with an interesting color. It has right angle cleavage and often breaks into interesting shapes. Shop for Orthoclase