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Shilovite, natural copper(II) tetrammine nitrate, a new mineral species

Published online by Cambridge University Press:  02 January 2018

Nikita V. Chukanov
Affiliation:
Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia
Sergey N. Britvin
Affiliation:
Institute of Geosciences, St Petersburg State University, Universitetskaya Nab. 7/9, St Petersburg, 199034 Russia
Gerhard Möhn
Affiliation:
Dr J. Wittemannstrasse 5, 65527 Niedernhausen, Germany
Igor V. Pekov
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991 Russia
Natalia V. Zubkova
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991 Russia
Fabrizio Nestola
Affiliation:
Dipartimento di Geoscienze, Università di Padova, Via Gradenigo 6, I-35131, Padova, Italy
Anatoly V. Kasatkin
Affiliation:
V/O “Almazjuvelirexport”, Ostozhenka Street 22, Block 1, 119034 Moscow, Russia
Maurizio Dini
Affiliation:
Pasaje San Augustin 4045, La Serena, Chile
Corresponding
E-mail address:

Abstract

The new mineral shilovite, the first natural tetrammine copper complex, was found in a guano deposit located on the Pabellón de Pica Mountain, near Chanabaya, Iquique Province, Tarapacá Region, Chile. It is associated with halite, ammineite, atacamite (a product of ammineite alteration) and thénardite. The gabbro host rock consists of amphibole, plagioclase and minor clinochlore, and contains accessory chalcopyrite. The latter is considered the source of Cu for shilovite. The new mineral occurs as deep violet blue, imperfect, thick tabular to equant crystals up to 0.15 mm in size included in massive halite. The mineral is sectile. Its Mohs hardness is 2. Dcalc is 1.92 g cm–3. The infrared spectrum shows the presence of NH3 molecules and NO3 anions. Shilovite is optically biaxial (+), α = 1.527(2), β = 1.545(5), γ = 1.610(2). The chemical composition (electron-microprobe data, H calculated from ideal formula, wt.%) is Cu 26.04, Fe 0.31, N 30.8, O 35.95, H 4.74, total 100.69. The empirical formula is H12.56(Cu1.09Fe0.01)N5.87O6.00. The idealized formula is Cu(NH3)4(NO3)2. The crystal structure was solved and refined to R = 0.029 based upon 2705 unique reflections having F > 4σ(F). Shilovite is orthorhombic, space group Pnn2, a = 23.6585(9), b = 10.8238(4), c = 6.9054(3) Å, V = 1768.3(1) Å3, Z = 8. The strongest reflections of the powder X-ray diffraction pattern [d, Å (I,%) (hkl)] are: 5.931 (41) (400), 5.841 (100) (011), 5.208 (47) (410), 4.162 (88) (411), 4.005 (62) (420), 3.462 (50) (002), 3.207 (32) (031), 2.811 (40) (412).

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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