IMA mineral species

Volkonskoite

Ca₀.₃(Cr,Mg,Fe)₂((Si,Al)₄O₁₀)(OH)₂ * 4H₂O

Smectite, phyllosilicate mineral.

Volkonskoite specimen — Volkonskoite-replaced fossil wood (Upper Permian; Mt. Efimiatsk, Chastinsky District, foothills of the Ural Mountains, Russia) 4.jpg · Wikimedia Commons (see file page for author & license)

Properties

Chemical formula	Ca₀.₃(Cr,Mg,Fe)₂((Si,Al)₄O₁₀)(OH)₂ * 4H₂O
Elements	Ca, Cr, Mg, Fe, Si, Al, O, H
Crystal system	—
Mohs hardness	—
Density	—
Streak	—
Color	—
IMA symbol	Vkn
Nickel–Strunz class	9.EC.40

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

Learn more

Volkonskoite on Mindat.org
Wikidata item Q4016140 (source of this page's data – you can correct it there)