Crystopedia
IMA mineral species

Ferrisepiolite

🪶 Soft, Scratches Easily

(Fe³⁺,Fe²⁺,Mg)₄[(Si,Fe³⁺)₆O₁₅](O,OH)₂·6H₂O

Phyllosilicate mineral.

Properties

⛏ Mohs hardness2 – 2.5
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💅🪙🍶🔪💎

Scratches with a fingernail.

🔷 Orthorhombic✏️ streak white✏️ streak brown
Chemical formula(Fe³⁺,Fe²⁺,Mg)₄[(Si,Fe³⁺)₆O₁₅](O,OH)₂·6H₂O
ElementsFe, Mg, Si, O, H
Crystal systemOrthorhombic
Mohs hardness2 – 2.5
Density—
Streakwhite, brown
Color—
IMA symbolFsep
Nickel–Strunz class9.00.

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

Care & Handling

  • 🪶 Soft, Scratches Easily Mohs 2 – 2.5: softer than a steel knife, so it scratches easily. Store it apart from harder stones.

🌍 Where it's found

Type locality (where it was first described): Saishitang Mine, People's Republic of China

  • 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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