IMA mineral species

Brassite

Mg(AsO₃OH)·4H₂O

Hydrous arsenate mineral.

White & Clear

Brassite specimen
Rösslerite & Brassite-2.jpg · Wikimedia Commons (see file page for author & license)

Properties

🔷 Orthorhombic✏️ streak white
Chemical formulaMg(AsO₃OH)·4H₂O
ElementsMg, As, O, H
Crystal systemOrthorhombic
Mohs hardness—
Density—
Streakwhite
Color—
IMA symbolBsi
Nickel–Strunz class8.CE.15

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

🌍 Where it's found

Type locality (where it was first described): Jáchymov, Czech Republic

  • 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.