IMA mineral species
Potassic-ferro-ferri-sadanagaite
KCa₂Fe²⁺₃Fe³⁺₂(Si₅Al₃)O₂₂(OH)₂
Ca-amphibole, double chain inosilicate mineral.
Properties
⛏ Mohs hardness5.55 – 6.05
💅🪙🍶🔪💎
Scratches glass; quartz scratches it.
🔷 Monoclinic✏️ streak grey
| Chemical formula | KCa₂Fe²⁺₃Fe³⁺₂(Si₅Al₃)O₂₂(OH)₂ |
|---|---|
| Elements | K, Ca, Fe, Si, Al, O, H |
| Crystal system | Monoclinic |
| Mohs hardness | 5.55 – 6.05 |
| Density | — |
| Streak | grey |
| Color | black |
| Cleavage | {110} |
| IMA symbol | Pffsdg |
| Nickel–Strunz class | 9.DE.15 |
“—” means no reliable value in Wikidata yet. Check Mindat for full data.
🌍 Where it's found
Type locality (where it was first described): Ilmen Nature Reserve, Russia
- 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
- Potassic-ferro-ferri-sadanagaite on Mindat.org
- Wikidata item Q3909493 (source of this page's data – you can correct it there)
IMA mineral species
5–6
Monoclinic
Black