Rough Optical Calcite with Inclusions / 1.5-2.5" AVG - 1 KILO LOT Valentine's Day Pieces measure 1"-3" (AVERAGE SIZE)

Pieces measure 1"-3" (AVERAGE SIZE)

Average size range: 20 to 70 millimeters

Pieces measure approximately 3 to 4 inches (AVERAGE SIZE)

Pieces measure approximately 1"-2

Pieces measure approximately 40 to 50 millimeters (AVERAGE SIZE)

Rough Optical Calcite with Inclusions / 1.5-2.5" AVG - 1 KILO LOT Valentine's Day Pieces measure 1"-3" (AVERAGE SIZE)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.