General Information:
Chemical Formula:
Pb4(CO3)Cl6·(H2O)
Composition:
(Molecular Weight = 1,119.54 gm)
Hydrogen 0.18 % H
Lead 74.03 % Pb
Carbon 1.07 % C
Chlorine 19.00 % Cl
Oxygen 5.72 % O
Empirical Formula:
Pb4(CO3)Cl6·(H2O)
Environment:
Quartz-dolomite ore vein exposed to sea water at the base of the cliff.
IMA Status:
Approved IMA 1989
Locality:
Bounds Cliff, St. Endellion, Cornwall, England.
Name Origin:
Named for Richard William Barstow (1947-1982), Cornish mineral dealer.
Physical Properties:
Cleavage:
[???] Indistinct
Color:
colorless or white.
Density:
5.5 - 5.69, Average = 5.59
Diaphaniety:
Transparent
Habits:
Microscopic Crystals - Crystals visible only with microscopes., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).,
Hardness:
3 - Calcite
Luster:
Adamantine
Streak:
white
More details...