IMA mineral species
Günterblassite
(K,Ca,Ba,Na,☐)₃Fe[(Si,Al)₁₃O₂₅(OH,O)₄]·7H₂O
Phyllosilicate mineral.
Properties
⛏ Mohs hardness4
💅🪙🍶🔪💎
A steel knife scratches it, it won't scratch glass.
| Chemical formula | (K,Ca,Ba,Na,☐)₃Fe[(Si,Al)₁₃O₂₅(OH,O)₄]·7H₂O |
|---|---|
| Elements | K, Ca, Ba, Na, Fe, Si, Al, O, H |
| Crystal system | Orthorhombic |
| Mohs hardness | 4 |
| Density | — |
| Streak | — |
| Color | — |
| IMA symbol | Gbl |
| Nickel–Strunz class | 9.EB.25 |
“—” means no reliable value in Wikidata yet. Check Mindat for full data.
Care & Handling
- 🪶 Soft, Scratches Easily Mohs 4: 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): Rother Kopf, Germany
- 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.
Learn more
- Günterblassite on Mindat.org
- Wikidata item Q19841404 (source of this page's data – you can correct it there)
IMA mineral species
4–5
Orthorhombic
Soft, Scratches Easily