IMA mineral species

Roscoelite

K(V³⁺,Al)₂(AlSi₃O₁₀)(OH)₂

True mica, phyllosilicate mineral.

GreenBrown

Roscoelite specimen
Gold & roscoelite (Stuckslacker Mine, Coloma, California, USA) (16562912783).jpg · Wikimedia Commons (see file page for author & license)

Properties

Chemical formulaK(V³⁺,Al)₂(AlSi₃O₁₀)(OH)₂
ElementsK, V, Al, Si, O, H
Crystal systemMonoclinic
Mohs hardness2.5
Density—
Streak—
Color—
IMA symbolRcl
Nickel–Strunz class9.EC.15

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