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
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]

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.

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]

• 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 (1): 119–126. 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" (PDF). 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): 723–726. Bibcode:1955MinM...30..723K. 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" (PDF). {{cite journal}}: Cite journal requires |journal= (help)
• 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. Bibcode:2002JMPeS..97..207M. doi:10.2465/jmps.97.207.

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