BLT183 Black Tourmaline Designer Each type of the Lake

Each type of the Lake Superior region's agates are discussed in-depth

with occasional hints of blue or yellow

Hardness ranks about a 7 on the Mohs Hardness Scale

From the Australian Outback

BLT183 Black Tourmaline Designer Each type of the LakeBlack Tourmaline crystal. 2. 75" x 1. 75" x 3. 5" 1. 25 lb Black Tourmaline is also called Schorl, and accounts for ninety five percent of all Tourmaline in nature. It is black, or sometimes a deep blue that appears black. The term Schorl was in use before the 1400s, named for a town in Saxony, Germany, where Black Tourmaline was found in nearby tin mines. Black Tourmaline belongs to a complex family of aluminum borosilicate mixed with iron,