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| Moonstone (Belomorite) from Kola Peninsula |
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More Belomorite on ebay auction |
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Moonstone (Belomorite) Russian Iridescent acid plagioclase (peristerites-" belomorites ") from pegmatites of Dlinnolambinskoye field of North Karelia. Trade name for moonstone from the White Sea - BELOMORITE. A Moonstone is a type of gemstone (see orthoclase). en.wikipedia.org Orthoclase (KAlSi3O8) is an important igneous rock forming tectosilicate mineral. It is also known as alkali feldspar and is common in granite and related rocks. Orthoclase is named based on the Greek for "straight fracture," because its two cleavages are at right angles to each other. Orthoclase crystallizes in the monoclinic crystal system. It has a hardness of 6, a specific gravity of 2.56-2.58, and a vitreous to pearly luster. It can be colored white, gray, yellow or red; rarely green. Twinned crystals are quite common. Orthoclase is a common constituent of most granites and other felsic igneous rocks and is often found in huge crystals and masses in pegmatite veins. |
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