Monteneroite, Cu2+Mn22+(AsO4)2•8H2O, a new vivianite-structure mineral with ordered cations from the Monte Nero mine, Liguria, Italy

被引:1
作者
Kampf, Anthony R. [1 ]
Plasil, Jakub [2 ]
Nash, Barbara P. [3 ]
Ciriotti, Marco E. [4 ,5 ]
Castellaro, Fabrizio [6 ]
Chiappino, Luigi [7 ]
机构
[1] Nat Hist Museum Los Angeles Cty, Mineral Sci Dept, 900 Exposit Blvd, Los Angeles, CA 90007 USA
[2] Inst Phys ASCR, Vvi, Na Slovance 1999-2, Prague 18221 8, Czech Republic
[3] Univ Utah, Dept Geol & Geophys, Salt Lake City, UT 84112 USA
[4] Assoc Micromineral Italiana, Via San Pietro 55, I-10073 Turin, Italy
[5] Univ Torino, Dipartimento Sci Terra, Via Tommaso Valperga Caluso 35, I-10125 Turin, Italy
[6] Via XXV Aprile 28, I-16046 Mezzanego, Italy
[7] Via Palmanova 67, I-20132 Milan, Italy
关键词
monteneroite; new mineral; crystal structure; Raman spectroscopy; vivianite structure type; Monte Nero mine; Liguria; Italy; CRYSTAL-STRUCTURE; BOND-VALENCE; ANNABERGITE; ERYTHRITE; MEMBER;
D O I
10.1180/mgm.2020.76
中图分类号
P57 [矿物学];
学科分类号
070901 ;
摘要
Monteneroite (IMA2020-028), Cu2+Mn22+(AsO4)(2)center dot 8H(2)O, is a new vivianite-structure mineral from the Monte Nero mine, Rocchetta di Vara, La Spezia, Liguria, Italy. It is a secondary mineral that crystallised from As-, Cu- and Mn-rich fluids and it is associated with braunite, copper, cuprite, rhodochrosite and strashimirite. Monteneroite occurs as light green, thick blades up to similar to 2.5 mm long. The streak is white. Crystals are transparent with vitreous lustre. The mineral has Mohs hardness of 2, is somewhat sectile, exhibits two cleavages ({010} perfect and {001} fair) and has irregular stepped fracture. The measured density is 2.97(2) g cm(-3). Monteneroite is optically biaxial (+), with alpha = 1.604(2), beta = 1.637(2) and gamma = 1.688(2), determined in white light; 2V = 80(1)degrees; slight dispersion is r < v, orientation: X = b; Z <^> c = 52 degrees in obtuse beta. Electron microprobe analyses provided the empirical formula (Cu0.882+Mn0.112+)(Sigma 0.99)Mn-2.00(2+)(As1.00O4)(2).8H(2)O. Monteneroite is monoclinic, C2/m, a = 10.3673(14), b = 13.713(2), c = 4.8420(8) angstrom, beta = 105.992(8)degrees, V = 661.72(18) angstrom(3) and Z = 2. Monteneroite has a vivianite-type structure (R-1 = 0.0535 for 534 I > 2 sigma I reflections). It is the first mineral with this structure type to be defined with ordered octahedral cation sites.
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页码:881 / 887
页数:7
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