Corundum

Al2O3

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Corundum is the second hardest natural mineral after diamond. Its gem varieties are ruby (red, colored by chromium) and sapphire (all other colors). Synthetic corundum is widely used as an abrasive and in laser technology.

晶系 Trigonal
鉱物分類 04 Oxides and Hydroxides
モース硬度 9.0
比重 3.98-4.10
色 Red (ruby), blue (sapphire), various colors
光沢 Adamantine
条痕色 Colorless
劈開 None
断口 Conchoidal to uneven
透明度 Transparent
結晶習性 Tabular, prismatic, bipyramidal

モース硬度

Mohs Hardness: 9.0 – 9.0
1 Soft10 Hard

晶系

Trigonal

Explore on Science FYI

ChemFYI
Aluminum (Al) Primary metal in Al₂O₃
ChemFYI
Oxygen (O) Part of Al₂O₃ formula
GemFYI
Ruby Red corundum variety (Cr-doped)
GemFYI
Sapphire Blue corundum variety (Fe/Ti-doped)

Frequently Asked Questions

What is the hardness of Corundum?
Corundum has a Mohs hardness of 9.0.
What crystal system does Corundum belong to?
Corundum crystallizes in the Trigonal crystal system.
What color is Corundum?
Corundum is typically Red (ruby), blue (sapphire), various colors.
What type of luster does Corundum have?
Corundum exhibits a Adamantine luster.
What is the chemical formula of Corundum?
The chemical formula of Corundum is Al2O3.