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

Smoky Quartz

orthorhombic crystals or in massive form

It may also be called Rocky Butte Picture Jasper

and the material has not been treated with dye

It is often used in kiln furniture and foundry molds

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