Coronadite
Mineral PbMn8O16
Take care.
- Contains lead: Wash your hands after handling it, keep it away from children, and don't make dust.
About it
Black, banded botryoidal crusts much like psilomelane but heavier, because they contain lead. Forms where lead and manganese ores weather; first described from the Coronado vein in Arizona.
- Type
- Mineral
- Group
- Oxide, hollandite group
- Formula
- PbMn8O16
- Hardness (Mohs)
- 4.5–5
- Specific gravity
- 5.4–5.5
- Streak
- brownish black
- Lustre
- submetallic, dull
- Crystal system
- Monoclinic
- Colours
- black, dark grey
- Transparency
- opaque
Typical values: real specimens vary. For more, see mindat.org.