Compared with augite or hornblende, tourmaline has poor cleavage and can be harder than those minerals. Clear and colored tourmaline can be a gemstone. The typical black form is usually referred to as schorl. Don't forget, whilst anthracite appears visually beautiful and might be an interesting addition on your https://goldwomensrhinestonepearl87530.ziblogs.com/28276203/a-secret-weapon-for-pink-womens-flower-open-toe-slingback-heeled-sandals