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A rare combination: the classic look of the inclusion of a horse's tail in a clear stone. Such stones are typical for the channel placer (aluvium, already worked out). Sometimes it is possible to hook a thin lens, which the "grandfathers" simply did not work out. It is too small for those times, 10-15 cm of thickness at a depth of 2-3 meters with a constant water inflow Apparently, the famous term "horsetail" originated from such stones.

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«…cube can not be measured by line…»

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"Identity card" of the russian demantoid. And the whole variety of these unique formations is divided into several types. Of course, with some generalization. It is possible to identify the main types of "horsetail" inclusions Ural demantoid

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