Black Spinel 4mm Faceted Coin - 15-16 Inch Specimens Moonstone is a Feldspar mineral

Moonstone is a Feldspar mineral that was used in Roman jewelry nearly 2

midnight blue glass with flecks of copper suspended within it

and pattern

making it ideal for determining the size

It contains inclusions such as copper and iron

Black Spinel 4mm Faceted Coin - 15-16 Inch Specimens Moonstone is a Feldspar mineralSpinel 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.