Alunite
Alunite is a mineral with the chemical formula KAl3(SO4)2(OH)6. It has a Mohs hardness of 4.5 - 5 and vitreous to pearly luster.
Alunite properties
| Type | Mineral |
|---|---|
| Chemical formula | KAl3(SO4)2(OH)6 |
| Mohs hardness | 4.5 - 5 |
| Luster | vitreous to pearly |
| Typical colors | white, gray, yellow, red, or brown |
| Formation | Forms in volcanic and hydrothermal environments from the alteration of feldspars and related minerals. |
| Rarity | 5 / 10 |
Mohs hardness 4.5–5 — medium
1 · Talc5 · Apatite10 · Diamond
Mineralyst
Wondering what you found?
Point your camera at any mineral and Mineralyst identifies it in seconds — with guided follow-up questions for a confident answer.
- Build a collection
- Keep a wish list
- 5 photos per find
- Share with friends
