Properties
⛏ Mohs hardness4
💅🪙🍶🔪💎
A steel knife scratches it, it won't scratch glass.
| Chemical formula | Co²⁺Co³⁺₂Se₄ |
|---|---|
| Elements | Co, Se |
| Crystal system | Cubic |
| Mohs hardness | 4 |
| Density | — |
| Streak | — |
| Color | — |
| IMA symbol | Bhd |
| Nickel–Strunz class | 2.DA.05 |
“—” 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): Trogtal quarries, Lautenthal, 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
- Bornhardtite on Mindat.org
- Wikidata item Q3642693 (source of this page's data – you can correct it there)
IMA mineral species
4–5
Cubic
Soft, Scratches Easily