IMA mineral species
Tweddillite
CaSr(Mn³⁺₂Al)[Si₂O₇][SiO₄]O(OH)
Epidote supergroup, sorosilicate mineral.
Properties
| Chemical formula | CaSr(Mn³⁺₂Al)[Si₂O₇][SiO₄]O(OH) |
|---|---|
| Elements | Ca, Sr, Mn, Al, Si, O, H |
| Crystal system | Monoclinic |
| Mohs hardness | — |
| Density | — |
| Streak | — |
| Color | — |
| IMA symbol | Twe |
| Nickel–Strunz class | 9.BG.05 |
“—” means no reliable value in Wikidata yet. Check Mindat for full data.
🌍 Where it's found
Type locality (where it was first described): Wessels mine, South Africa
- 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
- Tweddillite on Mindat.org
- Wikidata item Q3844522 (source of this page's data – you can correct it there)
IMA mineral species
Monoclinic