This piece of black tourmaline is a beautifully formed whole crystal with a terminated end. The striations along the length of the crystal are vivid and defined.
Tourmaline is one of the birthstones for October. It is the name of a large group of boron silicate minerals, which share common crystal structure. However, despite the similarity in physical properties, tourmaline occurs in a broad range of colors.
Size: 2 x 1.38 x 1 inches
Weight: ~ 4oz.