Crystopedia
IMA mineral species

Ferri-winchite

☐(NaCa)(Mg₄Fe³⁺)Si₈O₂₂(OH)₂

Na-Ca-amphibole, double chain inosilicate mineral.

Black

Ferri-winchite specimen
RM3784 - Ferriwinchita 'Imerinita'.jpg · Wikimedia Commons (see file page for author & license)

Properties

⛏ Mohs hardness5 – 6
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💅🪙🍶🔪💎

Scratches glass; quartz scratches it.

🔷 Monoclinic✏️ streak grey
Chemical formula☐(NaCa)(Mg₄Fe³⁺)Si₈O₂₂(OH)₂
ElementsNa, Ca, Mg, Fe, Si, O, H
Crystal systemMonoclinic
Mohs hardness5 – 6
Density—
Streakgrey
Colorblack
Cleavage{110}
IMA symbolFwnc
Nickel–Strunz class9.DE.20

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

🌍 Where it's found

Type locality (where it was first described): Ilmen mountains, Russia

  • Type locality
  • Notable source / deposit
  • Country of origin

Marker positions are approximate (region or locality level). Type localities from Wikidata; notable sources curated by Crystopedia.

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