Spinel
Mineral or gemstone
Spinel
Spinel () is the magnesium/aluminium member of the larger spinel group of minerals. It has the formula MgAl2O4 in the cubic crystal system. The name comes from the Latin word spinella, a diminutive form of spine, in reference to its pointed crystals.
Read on Wikipedia · Image Robert M. Lavinsky, CC BY-SA 3.0
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