IMA mineral species

Eucairite

🪶 Soft, Scratches Easily

AgCuSe

Selenide mineral.

Eucairite specimen
Eucairite-purpleSky.jpg · Wikimedia Commons (see file page for author & license)

Properties

⛏ Mohs hardness2.5
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💅🪙🍶🔪💎

Scratches with a fingernail.

Chemical formulaAgCuSe
ElementsAg, Cu, Se
Crystal systemOrthorhombic
Mohs hardness2.5
Density—
Streak—
Color—
IMA symbolEca
Nickel–Strunz class2.BA.50

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

Care & Handling

  • 🪶 Soft, Scratches Easily Mohs 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): Skrikerum mine, Sweden