Large Optical Calcite. Clear with a soft lavender tinge color. Madagascar. 3.25 inch by 3 1/8 by 1 1/8 inch thick. Nice double refraction

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Large Optical Calcite. Clear with a soft lavender tinge color which we have never seen. Madagascar. 3.25 inch by 3 1/8 by 1 1/8 inch thick. Nice double refraction. 1 pound 2 ounces. Tough to fine good larger calcite blocks. Will self stand on edge.

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