Rough Optical Calcite with Inclusions / 1.5-2.5" AVG - 1 KILO LOT Valentine's Day Pieces measure approximately 1"-2

Pieces measure approximately 1"-2

Pieces measure approximately 1-2" / ADJUSTABLE RING

Pieces measure approximately 40 to 50 millimeters (AVERAGE SIZE)

Tumbled Polished Shungite

Pieces measure 1"-3" (AVERAGE SIZE)

Rough Optical Calcite with Inclusions / 1.5-2.5" AVG - 1 KILO LOT Valentine's Day Pieces measure approximately 1"-2Quantity: 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.