Cobaltoan Calcite #23 Black Tourmaline The blue shades of Sodalite

The blue shades of Sodalite are found intermingled with white Calcite

tension and grief

and all could contain dendrite formations

This property of pyroelectricity (from heat) or piezoelectricity (from pressure or rubbing) was known to Dutch traders who used the crystals to pull ashes from their meerschaum pipes

Cobaltoan Calcite #23 Black Tourmaline The blue shades of Sodalite91g 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