Calcite (Var: Glendonite)

Unknown Owner

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These specimens have confused collectors since they first came out in the early 1990s as calcite after something embedded in concretions, then glendonite after ikaite, then as calcite after ikaite; and now classified as calcite variety thinolite, which is a pseudomorph after an unknown mineral. This is a strange, biomorphic-looking pseudomorph from Russia. These big, sharp orange-brown pseudomorphed crystals measure up to 4 cm in length. Unlike most of them, which are somewhat radial, this features a large oriented crystal, as if a rocket had just impaled the concretion around the crystals. This Photo was Mindat.org Photo of the Day - 31st Dec 2006