IMA mineral species
Riebeckite
☐Na₂(Fe²⁺₃Fe³⁺₂)Si₂O₂₂(OH)₂
Na-amphibole, double chain inosilicate mineral.
Properties
⛏ Mohs hardness5 – 7
💅🪙🍶🔪💎
Harder than quartz: scratches glass and steel.
| Chemical formula | ☐Na₂(Fe²⁺₃Fe³⁺₂)Si₂O₂₂(OH)₂ |
|---|---|
| Elements | Na, Fe, Si, O, H |
| Crystal system | Monoclinic |
| Mohs hardness | 5 – 7 |
| Density | — |
| Streak | — |
| Color | — |
| IMA symbol | Rbk |
| 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): Socotra, Yemen
- 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.
Varieties & related stones
Learn more
- Riebeckite on Mindat.org
- Wikipedia article
- Wikidata item Q256865 (source of this page's data – you can correct it there)
IMA mineral species
5–6
Monoclinic
YellowGreenBlueBlack