Black Spinel 5-6mm Drop Faceted Top Drill - 8 Inch HPS07152022 Clear Quartz

Clear Quartz

and the material has not been treated with dye

most turquoise on the market is stabilized to improve durability

orthorhombic crystals or in massive form

It is often used in kiln furniture and foundry molds

Black Spinel 5-6mm Drop Faceted Top Drill - 8 Inch HPS07152022 Clear QuartzSpinel 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.