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Gemstone Cabochons St - Th |
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Stromatolite Cabochons (Mary Ellen Jasper) |
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Stromatolite (aka Mary Ellen Jasper) is the fossilized buildup of microbial mats that form in limestone. Formed by trapping particles of microorganisms such as bacteria and algae, these mats typically form above the sea floor. Stromatolite includes the oldest known fossils, dating back some 3.5 billion years to the earliest forms of life. Click on image for details |
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 Item 1882 |
 Item 1884 |
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Sunstone Cabochons |
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Sunstone is a plagioclase feldspar which appears in different directions to have brilliant shimmering patches. This is caused by tiny enclosed scales of red hematite which reflect light. Sunstone is not rare and is found in Norway, Siberia, India and the United States. Sunstone is the state stone of Oregon and is found there in Harney and Lakes Counties. This variety of sunstone contains inclusions of copper crystals. |
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 Item 1925 |
 Item 1781  |
 Item 1756 |
 Item 1751 |
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Thulite is a variety of the mineral ziosite, that is manganese rich and occurs in opaque pink masses. It is often mottled with white and used as a gemstone and carving material. |
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Item 1901 |
 Item 1808 |
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