IMA mineral species
Magnesio-fluoro-arfvedsonite
NaNa₂(Mg₄Fe³⁺)Si₈O₂₂F₂
Na-amphibole, double chain inosilicate mineral.
Properties
⛏ Mohs hardness5 – 6
💅🪙🍶🔪💎
Scratches glass; quartz scratches it.
🔷 Monoclinic✏️ streak white
| Chemical formula | NaNa₂(Mg₄Fe³⁺)Si₈O₂₂F₂ |
|---|---|
| Elements | Na, Mg, Fe, Si, O, F |
| Crystal system | Monoclinic |
| Mohs hardness | 5 – 6 |
| Density | — |
| Streak | white |
| Color | grey |
| Cleavage | {110} |
| IMA symbol | Mfarf |
| 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): Ilmen Nature Reserve, Russia · Vishnevye mountains, Russia · Vishnevye mountains, 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
- Magnesio-fluoro-arfvedsonite on Mindat.org
- Wikidata item Q3746850 (source of this page's data – you can correct it there)
IMA mineral species
5–6
Monoclinic
Gray