Leopard Skin Jasper

Trade name for a type of rhyolite with a characteristic pattern.

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Rhyolite, from Greek ῥεῖν rheĩn, to flow and λίθος líthos, stone, is a volcanic rock mainly consisting of quartz and feldspar.

Most rhyolites are of light colour, with a quartz content varying between 20 % and 60% and show porpyhyric structure, that is a fine grained matrix with embedded coarse crystals.

Old names for rhyolite were quartz porphyry and liparite, after the Lipari Islands (better known as Aeolian Islands) north of Sicily.