General Information:
Chemical Formula:
Ca2Pb3(AsO4)3Cl
Composition:
(Molecular Weight = 1,153.97 gm)
Calcium 6.95 % Ca
Arsenic 19.48 % As
Lead 53.87 % Pb
Chlorine 3.07 % Cl
Oxygen 16.64 % O
Empirical Formula:
Pb3Ca2(AsO4)3Cl
IMA Status:
Accepted IMA 1972
Locality:
Langban, Varmland, Sweden.
Name Origin:
From the Greek hedy - "beautifully bright," in allusion to the high luster.
Physical Properties:
Cleavage:
[1011] Imperfect
Color:
blue, gray white, yellowish white, or white.
Density:
5.8 - 5.82, Average = 5.81
Diaphaniety:
Translucent
Habits:
Massive - Granular - Common texture observed in granite and other igneous rock., Crystalline - Coarse - Occurs as well-formed coarse sized crystals.,
Hardness:
4-5 - Fluorite-Apatite
Luminescence:
Weakly Fluorescent, Short UV=light yellow, Long UV=light yellow.
Luster:
Adamantine - Resinous
Streak:
white
More details...