Lindgrenite is an uncommon copper molybdate mineral with formula: Cu3(MoO4)2(OH)2. It occurs as tabular to platey monoclinic green to yellow green crystals.
Lindgrenite | |
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General | |
Category | Molybdate mineral |
Formula (repeating unit) | Cu3(MoO4)2(OH)2 |
IMA symbol | Lgr[1] |
Strunz classification | 7.GB.05 |
Dana classification | 48.3.1.1 |
Crystal system | Monoclinic |
Crystal class | Prismatic (2/m) (same H-M symbol) |
Space group | P21/n |
Unit cell | a = 5.394, b = 14.023 c = 5.608 [Å]; β = 98.5°; Z = 2 |
Identification | |
Color | Green to yellowish green |
Crystal habit | Tabular to platey crystals, may be acicular, massive or crust forming |
Cleavage | Perfect on {010} and {101}, poor on {100} |
Fracture | Micaceous |
Tenacity | Brittle |
Mohs scale hardness | 4.5 |
Luster | Greasey |
Streak | Pale green |
Diaphaneity | Transparent |
Specific gravity | 4.2 |
Optical properties | Biaxial (-) |
Refractive index | nα = 1.930 nβ = 2.002 nγ = 2.020 |
Birefringence | δ = 0.090 |
2V angle | 71° (measured) |
References | [2][3][4] |
It was first described in 1935 for an occurrence in the Chuquicamata Mine, Antofagasta, Chile, and named for Swedish–American economic geologist Waldemar Lindgren (1860–1939) of the Massachusetts Institute of Technology.[2][3]
Lindgrenite occurs in the oxidized portions of copper–molybdenum bearing sulfide ore deposits. Associated minerals include antlerite, molybdenite, powellite, brochantite, chrysocolla, iron oxides and quartz.[2]
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