IMA mineral species
Kruijenite
Ca₄Al₄(SO₄)F₂(OH)₁₆*₂H₂O
Hydrous sulfate mineral.
Properties
⛏ Mohs hardness3
💅🪙🍶🔪💎
A copper coin scratches it.
| Chemical formula | Ca₄Al₄(SO₄)F₂(OH)₁₆*₂H₂O |
|---|---|
| Elements | Ca, Al, S, O, F, H |
| Crystal system | Tetragonal |
| Mohs hardness | 3 |
| Density | — |
| Streak | — |
| Color | — |
| IMA symbol | Kje |
“—” means no reliable value in Wikidata yet. Check Mindat for full data.
Care & Handling
- 🪶 Soft, Scratches Easily Mohs 3: 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): Hinterweiler, 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
- Kruijenite on Mindat.org
- Wikidata item Q57846015 (source of this page's data – you can correct it there)
IMA mineral species
3–4
Tetragonal
Soft, Scratches Easily