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White, pseudo-cubic Cryolite crystals from Ivigtut, Arsukfjord, Grønland, Denmark. Everybody wants Cryolite crystals, but they are hard to come by and most people get fooled by either Thomsenolite/Pachnolite or by Ralstonite. Most specimens of white Cryolite crystals originate from finds in the early 20th Century and have monoclinic pseudo-cubic crystals in parallel growth on massive Cryolite. These were hydrothermally deposited later than the main mass of Cryolite and at lower temperatures. Specimens are occasionally available from old collections. |
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Black, dodecahedral Cryolite crystal from Ivigtut, Arsukfjord, Grønland, Denmark. A much rarer though to most people less appealing kind of Cryolite crystals was found chiefly in the 1980s and 1990s: black, modified dodecahedra, imbedded in fine-grained Muscovite. These are almost invariably damaged due to the adherence of the Muscovite and moderately complete specimens are very rare. |
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This is a pretty piece of standard-issue Cryolite from Ivigtut, Arsukfjord, Grønland, Denmark. The white cryolite contains imbedded phenocrysts of Siderite (brown cleavages), Quartz (not visible on photo) and Sphalerite (black). |
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A druse of Pachnolite crystals from Ivigtut, Arsukfjord, Grønland, Denmark. |
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Pale blue Prosopite from Ivigtut, Arsukfjord, Grønland, Denmark. Note, the crystals are not Prosopite, they are chiefly Thomsenolite and to a lesser extent Ralstonite. |
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A druse of Ralstonite crystals from Ivigtut, Arsukfjord, Grønland, Denmark. |
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A unique combination - a large crystal of Stenonite, imbedded in Topaz from Ivigtut, Arsukfjord, Grønland, Denmark. |
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Huge Thomsenolite crystals from Ivigtut, Arsukfjord, Grønland, Denmark. |
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Massive Weberite from Ivigtut, Arsukfjord, Grønland, Denmark. |
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