Ruby
gem · rare
Quick facts
- Formula
- Al2O3:Cr
- Hardness
- 9
- Luster
- vitreous
- Colors
- red
Ruby is a precious gemstone known for its deep red color, caused by chromium impurities.
Look for deep red color and high hardness; often fluoresces under UV light.
Scan yours
Photograph your specimen on arockid.com or in RockSnap / RockID. Three free IDs a day — no card.
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