Another name for calcite, the common mineral made of calcium carbonate; often used when referring to translucent or crystalline varieties.
From 'calc-' (calcium) + 'spar' (a crystalline mineral, from German 'Spat'). An older English term for calcite, especially clear varieties like Iceland spar.
Calcspar was the original name miners and jewelers used for clear calcite crystals—especially the transparent 'Iceland spar' that Vikings reportedly used to navigate by polarizing sunlight!
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