IMA mineral species

Magnesio-foitite

(☐,Na)(Mg₂Al)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)

Tourmaline, cyclosilicate mineral.

Magnesio-foitite specimen — Magnesio-foitite tourmaline (Antananarivo Province, Madagascar) 4 (29644307752).jpg · Wikimedia Commons (see file page for author & license)

Properties

⛏ Mohs hardness7

12345678910

💅🪙🍶🔪💎

Harder than quartz: scratches glass and steel.

Chemical formula	(☐,Na)(Mg₂Al)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Elements	Na, Mg, Al, Si, O, B, H
Crystal system	Trigonal
Mohs hardness	7
Density	—
Streak	—
Color	—
IMA symbol	Mfoi
Nickel–Strunz class	9.CK.05

“—” means no reliable value in Wikidata yet. Check Mindat for full data.

Learn more

Magnesio-foitite on Mindat.org
Wikidata item Q3843275 (source of this page's data – you can correct it there)