Tourmaline 8x10-9x13mm Side Drilled Pebble - 15-16 Inch Chips TD AA Grade It is an aluminum borosilicate

It is an aluminum borosilicate mixed with iron

Smoky Quartz is a translucent smoky brown or gray variety of Quartz

and may also be referred to as Jacktree

calcium and aluminum with trace amounts of iron

also known as Amazon Stone

Tourmaline 8x10-9x13mm Side Drilled Pebble - 15-16 Inch Chips TD AA Grade It is an aluminum borosilicateTourmaline is classified as a semiprecious stone and occurs in a vast array of colors, everything from colorless to black, from pastel to bright to dark. It can even exhibit various colors within the same specimen. Its name derives from the Sinhalese word turamali, which translates to stone of many colors. Due to this variety of colors, Tourmaline has often been confused with other stones. Many stones in the Russian crown jewels from the 17th century