Cobaltoan Calcite #23 Black Tourmaline and all could contain dendrite

and all could contain dendrite formations

The quartz gets it blue color from ilemnite inclusions in llanite

and biotite

SAFE HANDLING: Some of these minerals are arsenic based

ranging from light to dark Grey

Cobaltoan Calcite #23 Black Tourmaline and all could contain dendrite91g 0. 201lbs 3. 21oz 2. 29" x 1. 52" x 1. 33" Cobaltoan Calcite also known as Cobalt Calcite, cobalto calcite, or cobaltocalcite. The physical properties of cobaltoan calcite are the same as those of calcite. It crystallizes in the hexagonal (trigonal) system, usually as rhombohedrons, scalenohedrons, and prisms. It has a Mohs hardness of 3. 0. It is an uncommon variety of Calcite that has been infused with small amounts of the accessory element