Spinel
MgAl2O4
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Spinel is a magnesium aluminum oxide that forms beautiful crystals highly valued as gemstones. Many famous historical rubies, including the Black Prince's Ruby in the British Crown Jewels, are actually red spinels. Spinel occurs in metamorphosed limestones and basic igneous rocks.
| Crystal System | Cubic (Isometric) |
| Mineral Class | 04 Oxides and Hydroxides |
| Mohs Hardness | 7.5-8.0 |
| Specific Gravity | 3.58-3.61 |
| Color | Red, blue, green, black, colorless |
| Luster | Vitreous |
| Streak | White |
| Cleavage | None |
| Fracture | Conchoidal |
| Transparency | Transparent |
| Crystal Habit | Octahedral, massive |
Mohs Hardness
Mohs Hardness: 7.5 – 8.0
1 Soft10 Hard
Crystal System
Cubic (Isometric)Explore on Science FYI
Frequently Asked Questions
What is the hardness of Spinel?
Spinel has a Mohs hardness of 7.5-8.0.
What crystal system does Spinel belong to?
Spinel crystallizes in the Cubic (Isometric) crystal system.
What color is Spinel?
Spinel is typically Red, blue, green, black, colorless.
What type of luster does Spinel have?
Spinel exhibits a Vitreous luster.
What is the chemical formula of Spinel?
The chemical formula of Spinel is MgAl2O4.