IMA mineral species

Ferro-glaucophane

☐Na₂(Fe²⁺₃Al₂)Si₈O₂₂(OH)₂

Na-amphibole, double chain inosilicate mineral.

Ferro-glaucophane specimen — Ferro-glaucophane-773305.jpg · Wikimedia Commons (see file page for author & license)

Properties

⛏ Mohs hardness5 – 7

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💅🪙🍶🔪💎

Harder than quartz: scratches glass and steel.

🔷 Monoclinic

Chemical formula	☐Na₂(Fe²⁺₃Al₂)Si₈O₂₂(OH)₂
Elements	Na, Fe, Al, Si, O, H
Crystal system	Monoclinic
Mohs hardness	5 – 7
Density	—
Streak	—
Color	—
Cleavage	{110}
IMA symbol	Fgln
Nickel–Strunz class	9.DE.25

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

Learn more

Ferro-glaucophane on Mindat.org
Wikidata item Q3743239 (source of this page's data – you can correct it there)