General Information:
Chemical Formula:
[Mg(H2O)6]Ca2(H2O)13[Mo++++++8As+++++2Fe+++3O36(OH)]·4(H2O)
Composition:
(Molecular Weight = 2,196.70 gm)
Calcium 3.65 % Ca
Magnesium 1.11 % Mg
Iron 7.63 % Fe
Molybdenum 34.94 % Mo
Arsenic 6.82 % As
Hydrogen 2.16 % H
Oxygen 43.70 % O
Empirical Formula:
MgCa2Mo8As2Fe3+3O36(OH)·23(H2O)
Environment:
Oxidized Mo-As-Fe ores.
IMA Status:
Approved IMA 1961
Locality:
Bet-Pak-Dal desert, Kazakhstan.
Name Origin:
Named for the locality.
Physical Properties:
Cleavage:
[001] Perfect
Color:
bright lemon yellow or greenish yellow.
Density:
2.98 - 3.05, Average = 3.01
Habits:
Powdery - Forms a loose, poorly-coherent pulverulent mass., Aggregates - Made of numerous individual crystals or clusters.,
Hardness:
3 - Calcite
Luster:
Vitreous - Waxy
More details...