General Information:
Chemical Formula:
U++++(PO4)(OH)·2.5(H2O)
Composition:
(Molecular Weight = 395.05 gm)
Uranium 60.25 % U
Phosphorus 7.84 % P
Hydrogen 1.53 % H
Oxygen 30.38 % O
Empirical Formula:
U(PO4)(OH)·2.5(H2O)
Environment:
Found on quartz crystals associated with octahedral pyrite.
Locality:
Uzbekistan.
Name Origin:
Named for Vyacheslav Gavilovich Melkov (1911-), Russian mineralogist.
Physical Properties:
Cleavage:
[010] Distinct
Color:
green or dark green.
Density:
4.9 - 5.01, Average = 4.95
Habits:
Spherical - Spherical, rounded aggregates., Aggregates - Made of numerous individual crystals or clusters., Tabular - Form dimensions are thin in one direction.
Streak:
green
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