IMA mineral species
Oxo-magnesio-hastingsite
NaCa₂(Mg₂Fe³⁺₃)(Si₆Al₂)O₂₂O₂
Ca-amphibole, double chain inosilicate mineral.
Properties
⛏ Mohs hardness5 – 7
💅🪙🍶🔪💎
Harder than quartz: scratches glass and steel.
🔷 Monoclinic✏️ streak white
| Chemical formula | NaCa₂(Mg₂Fe³⁺₃)(Si₆Al₂)O₂₂O₂ |
|---|---|
| Elements | Na, Ca, Mg, Fe, Si, Al, O |
| Crystal system | Monoclinic |
| Mohs hardness | 5 – 7 |
| Density | — |
| Streak | white |
| Color | brown |
| Cleavage | {110} |
| IMA symbol | Omhst |
“—” means no reliable value in Wikidata yet. Check Mindat for full data.
🌍 Where it's found
Type locality (where it was first described): Gregory Rift, Tanzania
- 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
- Oxo-magnesio-hastingsite on Mindat.org
- Wikidata item Q17449767 (source of this page's data – you can correct it there)
IMA mineral species
5–6
Monoclinic
Brown