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The colors
giving some rubies a slightly brownish or purplish tint
Azurite often occurs with green Malachite
and architecture
Black Spinel 8mm Faceted Round - 15-16 Inch rocks-specimens The colorsSpinel 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.
