General Information:
Chemical Formula:
Cu3Al4(PO4)2(OH)12·2(H2O)
Composition:
(Molecular Weight = 728.63 gm)
Aluminum 14.81 % Al
Copper 26.16 % Cu
Phosphorus 8.50 % P
Hydrogen 2.21 % H
Oxygen 48.31 % O
Empirical Formula:
Cu3Al4(PO4)2(OH)12·2(H2O)
Environment:
Oxidation zone of massive pyrite enriched with Cu.
IMA Status:
Approved IMA
Locality:
Mt. Oxide Cu mine, 150 km N of Mt. Isa, Queensland, Australia.
Name Origin:
Named for Robert Sielecki (1958-), Australian geologist.
Physical Properties:
Cleavage:
None
Color:
sky blue or royal blue.
Density:
3.02
Diaphaniety:
Translucent
Habits:
Spherical - Spherical, rounded aggregates., Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Fibrous - Crystals made up of fibers.
Hardness:
3 - Calcite
Luminescence:
Non-fluorescent.
Luster:
Pearly
Streak:
light blue
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