IMA mineral species

Potassic-arfvedsonite

KNa₂(Fe²⁺₄Fe³⁺)Si₈O₂₂(OH)₂

Na-amphibole, double chain inosilicate mineral.

Properties

Chemical formula	KNa₂(Fe²⁺₄Fe³⁺)Si₈O₂₂(OH)₂
Elements	K, Na, Fe, Si, O, H
Crystal system	Monoclinic
Mohs hardness	—
Density	—
Streak	blue
Color	black
Cleavage	{110}
IMA symbol	Parf
Nickel–Strunz class	9.DE.25

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

🌍 Where it's found

Type locality (where it was first described): Palitra pegmatite, Karnasurt mine, Russia · Kirovskii apatite mine, Russia · Kangerluarsuk fjord, Ilímaussaq, Greenland

Learn more

Potassic-arfvedsonite on Mindat.org
Wikidata item Q3909496 (source of this page's data – you can correct it there)