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Spinel is a hard vitreous magnesium aluminum oxide
and Side Cutters
Black Eye Agate is a variety of Sardonyx which has a Sard base
creamy white to pale gray or beige
Black Spinel 5mm Round - 15-16 Inch Special-Tucson-Buy-2025 Spinel is a hard vitreousSpinel 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.
