General Information:
Chemical Formula:
(Pb,Ca)2Sb2O7
Composition:
(Molecular Weight = 644.55 gm)
Calcium 4.66 % Ca
Antimony 37.78 % Sb
Lead 40.18 % Pb
Oxygen 17.38 % O
Empirical Formula:
Pb1.25Ca0.75Sb2O7
Locality:
Harstig mine, Varmland, Sweden.
Name Origin:
Named from the Greek for "stable," because it decomposed chemically with great difficulty.
Physical Properties:
Cleavage:
[111] Indistinct, [111] Indistinct, [111] Indistinct
Color:
gray green, yellow, dark brown, or orange.
Density:
5.94 - 7.29, Average = 6.61
Diaphaniety:
Translucent to Opaque
Habits:
Microscopic Crystals - Crystals visible only with microscopes., ,
Hardness:
4.5-6
Luster:
Adamantine - Greasy
Streak:
yellow
More details...