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Spinel

Gemstone
Spinel is the magnesium/aluminium member of the larger spinel group of minerals. It has the formula MgAl ₂O ₄ in the cubic crystal system. Its name comes from the Latin word spinella, a diminutive form of spine, in reference to its pointed... Wikipedia
Colors: Black, Blue, Red, and more
Hardness (Mohs hardness scale): 7.5 – 8
Chemical formula: MgAl₂O₄
Refractive index: 1.712 – 1.736
Category: Oxide minerals; Spinel group; Spinel structural group
Crystal class: Hextetrahedral (43m); H–M symbol: (43m)
Crystal system: Cubic