IMA mineral species
Foitite
(☐,Na)(Fe²⁺₂Al)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃OH
Tourmaline, cyclosilicate mineral.
Properties
⛏ Mohs hardness7
💅🪙🍶🔪💎
Harder than quartz: scratches glass and steel.
| Chemical formula | (☐,Na)(Fe²⁺₂Al)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃OH |
|---|---|
| Elements | Na, Fe, Al, Si, O, B, H |
| Crystal system | Trigonal |
| Mohs hardness | 7 |
| Density | — |
| Streak | — |
| Color | — |
| IMA symbol | Foi |
| Nickel–Strunz class | 9.CK.05 |
“—” means no reliable value in Wikidata yet. Check Mindat for full data.
🌍 Where it's found
Type locality (where it was first described): California, 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
- Foitite on Mindat.org
- Wikipedia article
- Wikidata item Q3747023 (source of this page's data – you can correct it there)
IMA mineral species
7–8
Trigonal