Rough Optical Calcite with Inclusions / 1.5-2.5" AVG - 1 KILO LOT

Quantity: 1 kilogram

Average size range: 1.5 to 2.5 inches

Optical calcite, also known as Iceland spar, is a special type of calcite that forms extremely clear and somewhat rectangular crystals. For centuries, sailors would use these crystals to help determine the direction of the sun on cloudy days for navigation.