Spinel

Spinel gemstones are famous for their ruby-like deep red color. Of course, spinel includes other colors, such as pink, yellow, blue. Some people confuse it with ruby and some consider it in the group of garnets.

• Chemical Formula: MgAl2O4

• Color: Red, blue, black, gray, lilac, green, purple, brown, orange, orangish-red, colorless, and pink.

• Crystal Structure: octahedral crystals

• Luster: Vitreous

• Transparency: Mostly transparent but can be opaque

• Refractive Index: 1.719 to 1.920, depending on the variety

• Specific Gravity: 3.60

• Fracture: conchoidal

• Durability: high

• Cleavage: None

• Treatments: can be heat treated

• Inclusions: silk, spangles, feathers, or swirls.

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