Black Spinel 4mm Faceted Coin - 15-16 Inch Stone Type_Lavender Amethyst A variety of Andalusite

A variety of Andalusite

With only limited amounts of this highly sought-after material remaining

white or brown

The shell is often found naturally polished with a green or brown spiral on one side and a white "eye" on the other

Blue Apatite ranges in color from light teal to blue to bright blue to dark blue to green

Black Spinel 4mm Faceted Coin - 15-16 Inch Stone Type_Lavender Amethyst A variety of AndalusiteSpinel 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.