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A form of chalcedony made of quartz
Iron gives them blue
Unsealed granite may discolor when exposed to oil
Botswana Agate displays highly defined parallel banding
Black Spinel 9x13mm Twisted Drop - 8 Inch Peru A form of chalcedony madeSpinel 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.
