Black Spinel 8mm Faceted Round - 15-16 Inch rocks-specimens The yellowish colors of heliodor

The yellowish colors of heliodor are usually caused by small amounts of iron within the mineral's crystal structure

The colors

and architecture

but rather a speckled teal Jasper found in Africa and often treated to simulate the beautiful blue to green associated with true Turquoise

meaning it becomes magnetically charged from heat or friction

Black Spinel 8mm Faceted Round - 15-16 Inch rocks-specimens The yellowish colors of heliodorSpinel 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.