Boulangerite
Mineral Pb5Sb4S11
Also called Plumosite and Feather ore
Take care.
- Contains lead: Wash your hands after handling it, keep it away from children, and don't make dust.
- Toxic: Wash your hands after handling it, don't lick or taste it, and don't make dust.
- Fragile: Handle it gently and pack it well; it breaks or crumbles easily.
About it
Bluish lead-grey needles and plumose masses, often as hair-like inclusions in quartz and calcite. Common in lead-antimony veins; notable from Trepča, Kosovo, and Baia Sprie, Romania.
- Type
- Mineral
- Group
- Sulfosalt
- Formula
- Pb5Sb4S11
- Hardness (Mohs)
- 2.5–3
- Specific gravity
- 5.8–6.3
- Streak
- brownish grey
- Lustre
- metallic
- Crystal system
- Monoclinic
- Colours
- bluish lead grey
- Transparency
- opaque
- Cleavage and fracture
- good lengthwise
Typical values: real specimens vary. For more, see mindat.org.