Black Spinel 5mm Round - 15-16 Inch 8-Inch Strands Lava is rock from the

Lava is rock from the molten center of the earth

but differ in chemical composition

polished to show off all it's amazing colors

but its identity is complicated

Black Spinel 5mm Round - 15-16 Inch 8-Inch Strands Lava is rock from theSpinel is a hard vitreous magnesium aluminum oxide, and comes in a range of other colors, but those varieties are transparent. Black Spinel not only has the dark color, but it is opaque as well, rendering its black especially deep and mysterious. Sometimes called the "Black Prince's Ruby" for its role in the English crown. It has been mistaken for ruby and sapphire at times, but can be distinguished by its structure and its lower relative hardness.