IMA mineral species

Bradaczekite

🪶 Soft, Scratches Easily

NaCu₄(AsO₄)₃

Arsenate mineral.

Properties

⛏ Mohs hardness3
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💅🪙🍶🔪💎

A copper coin scratches it.

⚖ Density4.553 g/cm³
Very heavy
Chemical formulaNaCu₄(AsO₄)₃
ElementsNa, Cu, As, O
Crystal systemMonoclinic
Mohs hardness3
Density4.553 g/cm³
Streak—
Color—
IMA symbolBdc
Nickel–Strunz class8.AC.10

“—” 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): Second scoria cone, Russia