General Information:
Chemical Formula:
PbAl3(PO4)2(OH)5·(H2O)
Composition:
(Molecular Weight = 581.14 gm)
Aluminum 13.93 % Al
Phosphorus 10.66 % P
Hydrogen 1.21 % H
Lead 35.65 % Pb
Oxygen 38.54 % O
Empirical Formula:
PbAl3(PO4)2(OH)5·(H2O)
Name Origin:
Named after its composition: plumbum - "lead" and gummi - "indian rubber."
Physical Properties:
Cleavage:
None
Color:
white, gray, yellow, bluish green, or brown.
Density:
4 - 5, Average = 4.5
Diaphaniety:
Translucent
Habits:
Colloform - Forming from a gel or colloidal mass., Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite).,
Hardness:
4-5 - Fluorite-Apatite
Luminescence:
None.
Luster:
Greasy (Oily)
Streak:
white
More details...