Lindgrenite

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
Formula (repeating unit)	Cu3(MoO4)2(OH)2
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	[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[]

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]

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

Lindgrenite, Inspiration mine, Arizona. Size 2 cm.

References[]

Further reading[]

• 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 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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