Iolite
Iolite is a gemstone with the chemical formula Mg2Al4Si5O18. It has a Mohs hardness of 7 - 7.5 and vitreous luster.
Iolite properties
| Type | Gemstone |
|---|---|
| Chemical formula | Mg2Al4Si5O18 |
| Mohs hardness | 7 - 7.5 |
| Luster | Vitreous |
| Typical colors | Blue, violet, gray, colorless |
| Formation | Metamorphic rocks, often formed under high pressure and temperature conditions |
| Rarity | 6 / 10 |
Mohs hardness 7–7.5 — hard
1 · Talc5 · Apatite10 · Diamond
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