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Spinel is a hard, crystalline mineral that comes in many colors and is used as a gemstone:

• Color: Spinel can be colorless, red, lavender, violet, blue, green, brown, or black. The red variety is sometimes confused with rubies.

• Crystal shape: Spinel crystals are typically octahedral, which means they look like two pyramids back-to-back.

• Hardness: Spinel is a durable gem with a hardness of 8 on the Mohs scale.

• Chemical composition: Spinel's chemical formula is MgAl2O4, and it's made up of magnesium and aluminum.

• Transparency: Spinel is usually transparent, but can also be opaque.

• Luster: Spinel has a vitreous to dull luster.

• Origin: Spinel is found in alluvial deposits and igneous and metamorphosed carbonate rocks.