Compared with augite or hornblende, tourmaline has very poor cleavage and is usually more durable than those minerals. Clear and colored tourmaline can be a gemstone. The everyday black type is typically named schorl. ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​... https://ericknubhm.onzeblog.com/28124910/red-women-s-lace-up-stiletto-heel-an-overview