- Chemistry: Cu3Pb(AsO4)2
- H2O, Hydrated Copper Lead Arsenate Hydroxide
- Class: Phosphates
- Subclass: Arsenates
- Uses: Crafted as cabochons and as mineral specimens.
Bayldonite is another attractive arsenate mineral formed in the oxidation
zone of ore deposits. It has a nice green color and high resinous luster.
The color is mostly due to the copper content and the luster is mostly
due to the lead content. Many specimens contain some zinc as well.
which was discovered at Penberthy Croft Mine in Cornwall, England, can
be used to make attractive cabochons, but is also nice as cabinet specimens.
Specimens are known from only a few localities, so treasure any that can
- Color is green to yellow-green or yellow.
- Luster is resinous.
- Transparency: Crystals are transparent to translucent.
- Crystal System is monoclinic.
- Crystal Habits include tabular crystals, radiating fibrous,
granular and massive crusts.
- Cleavage is absent.
- Fracture is uneven.
- Hardness is 4.5
- Specific Gravity is approximately 5.5 (well above average for
- Streak is green.
- Associated Minerals are duftite,
azurite and limonite.
- Notable Occurrences include Penberthy Croft Mine and Wheal Carpenter
Mine, St. Hilary and St. Day, Cornwall, England; Arizona, USA and Tsumeb,
- Best Field Indicators are color, crystal habit, streak, lack
of cleavage, density, locality and associations.