Black Tourmaline 10mm Round - 15-16 Inch 16-inch Rounds blue or gray

blue or gray

it lightens because of further weathering and becomes Malachite

meaning it forms by replacing another mineral’s crystal structure atom by atom with its own crystal structure

It is a variety of banded Chalcedony with layers that may contain scarlet

Black Tourmaline 10mm Round - 15-16 Inch 16-inch Rounds blue or grayBlack Tourmaline is a black crystalline aluminum borosilicate mineral with occasional light gray inclusions that appear as flecks or veins. Tourmaline 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