General Information:
Chemical Formula:
Pb2Ca6(Si6O18)(SO4)2(OH)2·4(H2O)
Composition:
(Molecular Weight = 1,409.57 gm)
Calcium 17.06 % Ca
Silicon 11.95 % Si
Hydrogen 0.72 % H
Lead 29.40 % Pb
Sulfur 4.55 % S
Oxygen 36.32 % O
Empirical Formula:
Pb2Ca6Si6O18(SO4)2(OH)2·4(H2O)
Locality:
Franklin, Sussex Co., New Jersey, USA.
Name Origin:
Named after Washington A. Roebling (1837-1926), well known mineral collector and builder of the Brooklyn Bridge.
Physical Properties:
Cleavage:
[001] Perfect, [100] Indistinct
Color:
white or pink.
Density:
3.43
Diaphaniety:
Transparent to translucent
Habits:
Massive - Fibrous - Distinctly fibrous fine-grained forms., ,
Hardness:
3 - Calcite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
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