The listing, black tourmaline crystal has ended.
Schorl (black tourmaline ) it is a complex silicate of boron and aluminum. occurs in granite pegmatite.pegmatite are product form Ed as granite cools slowly deep in the earths crust.very large crystals form as the remaining liquids and rare gases not used in earlier crystallization stages react to form tourmaline and other rare minerals..metaphysically: promotes communication and understanding.