Beudantite
Mineral PbFe3(AsO4)(SO4)(OH)6
Take care.
- Contains lead: Wash your hands after handling it, keep it away from children, and don't make dust.
- Contains arsenic: Wash your hands after handling it, don't make dust, and never heat it.
About it
Small brown to dark green rhombohedral crystals and crusts in oxidized lead-iron ore, a lead arsenate-sulfate. Notable at Tsumeb in Namibia; named for French mineralogist François Beudant.
- Type
- Mineral
- Group
- Arsenate, alunite supergroup
- Formula
- PbFe3(AsO4)(SO4)(OH)6
- Hardness (Mohs)
- 3.5–4.5
- Specific gravity
- 4–4.3
- Streak
- greenish yellow
- Lustre
- vitreous (glassy), resinous
- Crystal system
- Trigonal
- Colours
- dark green, brown, black, yellow
- Transparency
- translucent, opaque
- Cleavage and fracture
- good basal
Typical values: real specimens vary. For more, see mindat.org.