IMA mineral species
Maruyamaite
K(MgAl₂)(Al₅Mg)(BO₃)₃(Si₆O₁₈)(OH)₃O
First IMA-approved K mineral, member of the tourmaline group.
Properties
⛏ Mohs hardness7
💅🪙🍶🔪💎
Harder than quartz: scratches glass and steel.
| Chemical formula | K(MgAl₂)(Al₅Mg)(BO₃)₃(Si₆O₁₈)(OH)₃O |
|---|---|
| Elements | K, Mg, Al, B, O, Si, H |
| Crystal system | Trigonal |
| Mohs hardness | 7 |
| Density | — |
| Streak | — |
| Color | — |
| IMA symbol | Mry |
| Nickel–Strunz class | 9.CK. |
“—” means no reliable value in Wikidata yet. Check Mindat for full data.
Learn more
- Maruyamaite on Mindat.org
- Wikidata item Q18614733 (source of this page's data – you can correct it there)
IMA mineral species
7–8
Trigonal