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Geology,
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Spar

Spar is an old mineralogical term denoting various crystallised minerals that have a lamellar structure. Iceland spar is a calcite.

A block of calcite (CaCO3), sometimes called spar, from Rueun, Grischun, in Switzerland. © Th. Schüpbach, SVSMF

A block of calcite (CaCO3), sometimes called spar, from Rueun, Grischun, in Switzerland. © Th. Schüpbach, SVSMF

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