IMA mineral species
Stewartite
Mn²⁺Fe³⁺₂(PO₄)₂(OH)₂ * 8H₂O
Phosphate mineral.
Properties
| Chemical formula | Mn²⁺Fe³⁺₂(PO₄)₂(OH)₂ * 8H₂O |
|---|---|
| Elements | Mn, Fe, P, O, H |
| Crystal system | Triclinic |
| Mohs hardness | 3 |
| Density | 2.94 g/cm³ |
| Streak | — |
| Color | — |
| IMA symbol | Stw |
| Nickel–Strunz class | 8.DC.30 |
“—” means no reliable value in Wikidata yet. Check Mindat for full data.
Care & Handling
- 🪶 Soft, Scratches Easily Mohs 3: softer than a steel knife, so it scratches easily. Store it apart from harder stones.
🌍 Where it's found
Type locality (where it was first described): Stewart mine, United States
- 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.
Learn more
- Stewartite on Mindat.org
- Wikidata item Q429803 (source of this page's data – you can correct it there)
IMA mineral species
3–4
Triclinic
Soft, Scratches Easily