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It is a variety of the mineral corundum
including lazurite
meaning it becomes magnetically charged from heat or friction
Tiger Iron has long been popular with jewelry-makers
Black Spinel 4x8mm Faceted Rondelle - 15-16 Inch R0305 It is a variety ofSpinel 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.