Barstowite
A variety of Minerals
What is Barstowite?
Barstowite, formula Pb4[Cl6|CO3]•H2O, is a transparent to white mineral in the monoclinic system. It has a Mohs hardness of 3, a white streak and an adamantine lustre. The type locality for Barstowite is Bounds Cliff, St Endellion, Cornwall in the United Kingdom. It is named after Richard W. Barstow (1947–1982), a Cornish mineral collector.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Barstowite 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.
Barstowite Localities Map
See where Barstowite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Transparent to white
- Hardness (Mohs)
- 3
- Density
- 5.77 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- Pb4Cl6(CO3) · H2O
- Elements
- C, Cl, H, O, Pb
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Barstowite FAQs
How do I identify Barstowite?
Barstowite can be identified by its hardness of 3 on the Mohs scale, Transparent to white color. Look for these key characteristics when examining specimens.
What color is Barstowite?
Barstowite typically appears in Transparent to white. Color can vary depending on impurities and formation conditions.
How hard is Barstowite?
Barstowite has a hardness of 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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