Lindgrenite

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Lindgrenite

Lindgrenite specimen from the San Samuel Mine of the Cachiyuyo de Llampos district, Copiapó Province, Atacama Region, Chile (field of view 4 mm)
General
Category Molybdate mineral
Formula
(repeating unit)		 Cu3(MoO4)2(OH)2
Strunz classification 7.GB.05
Dana classification 48.3.1.1
Crystal symmetry Monoclinic prismatic
H-M symbol: (2/m)
Space group: P 21/n
Unit cell a = 5.394 Å, b = 14.023 Å, 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
Crystal system Monoclinic
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 [1][2][3]

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.

Discovery and occurrence

Lindgrenite in a quartz vug from the type locality of Chuquicamata (size: 1.7 x 1.7 x 1.4 cm)

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.[1][2]

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.[1]

References

  1. ↑ 1.0 1.1 1.2 Lindgrenite in the Handbook of Mineralogy
  2. ↑ 2.0 2.1 Lindgrenite on Mindat.org
  3. ↑ Lindgrenite data on Webmineral

Further readings

  • Calvert, L. D.; Barnes, W. H. (1957). "The structure of Lindgrenite". Can Mineral 6 (1): 31–51. 
  • Xu, Jiasheng; Xue, Dongfeng (2007). "Hydrothermal synthesis of lindgrenite with a hollow and prickly sphere-like architecture". Journal of Solid State Chemistry 180: 119. Bibcode:2007JSSCh.180..119X. doi:10.1016/j.jssc.2006.09.030. 
  • Vilminot, Serge; André, Gilles; Richard-Plouet, Mireille; Bourée-Vigneron, Françoise; Kurmoo, Mohamedally (2006). "Magnetic Structure and Magnetic Properties of Synthetic Lindgrenite, Cu3(OH)2(MoO4)2". Inorganic Chemistry 45 (26): 10938–46. doi:10.1021/ic061182m. PMID 17173452. 
  • Frost, Ray L.; Duong, Loc; Weier, Matt (2004). "Raman microscopy of the molybdate minerals koechlinite, iriginite and lindgrenite". Neues Jahrbuch für Mineralogie - Abhandlungen 180 (3): 245. doi:10.1127/0077-7757/2004/0180-0245. 
  • Kingsbury, Arthur W. G. (1955). "On the Occurrence of the Rare Copper Molybdate, Lindgrenite, at Brandy Gill, Carrock Fell, Cumberland". Mineralogical Magazine 30 (230): 723. doi:10.1180/minmag.1955.030.230.06. 
  • Bao, R; Kong, Z; Gu, M; Yue, B; Weng, L; He, H (2006). "Hydrothermal Synthesis and Thermal Stability of Natural Mineral Lindgrenite1". Chemical Research in Chinese Universities 22 (6): 679. doi:10.1016/S1005-9040(06)60189-X. 
  • Barnes, W. H. The unit cell and space group of lindgrenite. 
  • Miyazaki, Iyo; Ohori, Shinji; Kishi, Shigetomo; Kobayashi, Shoichi; Kusachi, Isao (2002). "Lindgrenite from the Sansei mine, Nara Prefecture, Japan". Journal of Mineralogical and Petrological Sciences 97 (4): 207. doi:10.2465/jmps.97.207. 
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