Bayldonite
A variety of Minerals
What is Bayldonite?
Bayldonite (BAIL-done-ite) is a rare secondary mineral with the chemical formula PbCu3(AsO4)2(OH)2. It was first discovered in Penberthy Croft Mine, Cornwall, England, United Kingdom. It is named after its discoverer, John Bayldon (1837(8) – 1872). Specimens are also found in Tsumeb, Namibia, and Arizona, United States. It is sometimes used as a gemstone.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Bayldonite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Bayldonite Localities Map
See where Bayldonite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Green, apple-green, yellow-green, dark green to black
- Hardness (Mohs)
- 4.5
- Density
- 5.707 g/cm³
- Streak
- Siskin green to apple green
Chemical Properties
- Chemical Formula
- PbCu3(AsO4)2(OH)2
- Elements
- As, Cu, H, O, Pb
Also Known As
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Bayldonite FAQs
How do I identify Bayldonite?
Bayldonite can be identified by its hardness of 4.5 on the Mohs scale, Green color. Look for these key characteristics when examining specimens.
What color is Bayldonite?
Bayldonite typically appears in Green, apple-green, yellow-green, dark green to black. Color can vary depending on impurities and formation conditions.
How hard is Bayldonite?
Bayldonite has a hardness of 4.5 on the Mohs scale. This gives it moderate hardness.
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