IMA mineral species
Ferro-ferri-obertiite
NaNa₂(Fe²⁺₃Fe³⁺Ti⁴⁺)Si₈O₂₂O₂
Oxo amphibole, double chain inosilicate mineral.
Properties
🔷 Monoclinic✏️ streak grey
| Chemical formula | NaNa₂(Fe²⁺₃Fe³⁺Ti⁴⁺)Si₈O₂₂O₂ |
|---|---|
| Elements | Na, Fe, Ti, Si, O |
| Crystal system | Monoclinic |
| Mohs hardness | — |
| Density | — |
| Streak | grey |
| Color | black |
| Cleavage | {110} |
| IMA symbol | Ffob |
| Nickel–Strunz class | 9.DE.25 |
“—” means no reliable value in Wikidata yet. Check Mindat for full data.
🌍 Where it's found
Type locality (where it was first described): Coyote Peak, United States · Coyote Peak, 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
- Ferro-ferri-obertiite on Mindat.org
- Wikidata item Q19601089 (source of this page's data – you can correct it there)
IMA mineral species
Monoclinic
Black