Ruby
Al₂O₃
Variety of corundum, mineral, gemstone.
Properties
| Chemical formula | Al₂O₃ |
|---|---|
| Elements | Al, O |
| Crystal system | Trigonal |
| Mohs hardness | 9 – 9.5 |
| Density | 3.99 – 4.1 g/cm³ |
| Streak | white |
| Color | red, pink, ruby |
“—” means no reliable value in Wikidata yet. Check Mindat for full data.
✺ Glows under UV
| Longwave UV (~365 nm) | Strong red |
|---|---|
| Shortwave UV (~254 nm) | Red, usually weaker |
Chromium makes ruby fluoresce red (about 694 nm), even in daylight, which adds to its glow. Iron-rich rubies fluoresce much less.
Reactions vary by locality and specimen; many specimens of a fluorescent species do not glow. Shortwave UV can burn skin and damage eyes. Wear UV-blocking glasses, and never look into any UV lamp. Sources: Wikipedia: Ruby. More UV-reactive stones →
🌍 Where it's found
- Type locality
- Notable source / deposit
- Country of origin
Marker positions are approximate (region or locality level). Type localities from Wikidata; notable sources curated by Crystopedia.
Varieties & related stones
✨ Metaphysical & Folklore
These are traditional and folk beliefs from crystal lore. They are not scientific or medical claims – crystals are not a substitute for professional care.
The 'king of gems' in Sanskrit lore, ruby is associated with passion, vitality and protection.
💞 Pairs well with (traditional pairings)
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BloodstoneA natural partner for courage; Bloodstone also adds endurance.
GarnetPaired in tradition for passion, with Garnet bringing commitment as well.
HematiteBoth carry the theme of courage, so together they're thought to reinforce it.
Moss AgateAnother Heart & Root chakra stone, used alongside ruby for gardening luck.
Clear QuartzLifts and clarifies ruby's grounding energy; clear quartz is said to amplify any stone.
Learn more
- Ruby on Mindat.org
- Wikipedia article
- Wikidata item Q43088 (source of this page's data – you can correct it there)