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Triazolite, NaCu2(N3C2H2)2(NH3)2Cl3·4H2O, a new mineral species containing 1,2,4-triazolate anion, from a guano deposit at Pabellón de Pica, Iquique Province, Chile

Published online by Cambridge University Press:  02 May 2018

Nikita V. Chukanov
Affiliation:
Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432Russia
Natalia V. Zubkova
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991Russia
Gerhard Möhn
Affiliation:
Dr.-J.-Wittemannstrasse 5, 65527 Niedernhausen, Germany
Igor V. Pekov
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991Russia
Dmitriy I. Belakovskiy
Affiliation:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninsky Prospekt 8-2, Moscow, 117071Russia
Konstantin V. Van
Affiliation:
Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, Moscow Region 142432, Russia
Sergey N. Britvin
Affiliation:
Department of Crystallography, St Petersburg State University, University Embankment 7/9, 199034 St Petersburg, Russia
Dmitry Y. Pushcharovsky
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991Russia
Corresponding
E-mail address:

Abstract

The new mineral triazolite is found in a guano deposit located on the Pabellón de Pica Mountain, Iquique Province, Tarapacá Region, Chile. Associated minerals are salammoniac, halite, dittmarite, joanneumite, chanabayaite, nitratine, natroxalate and möhnite. Triazolite occurs as deep blue prismatic crystals up to 0.1 mm × 0.15 mm × 0.75 mm and their radial aggregates up to 1.5 mm across. The mineral is brittle. Its Mohs hardness is 2. Dcalc = 2.028 g cm–3. The infrared spectrum shows the presence of 1,2,4-triazolate anion and ammonia and water molecules. Triazolite is optically biaxial (–), α = 1.582(4), β = 1.625(3), γ = 1.625(3) and 2Vmeas = 5(3)°. The chemical composition (electron-microprobe data for Cl, Na, Fe and Cu; H, C, N and S contents were measured by gas chromatography of products of ignition at 1200°C; wt.%) is: Na 4.91, Fe 1.51, Cu 22.06, Cl 19.80, S 1.4, C 7.7, H 4.4, N 24.2, O (calc.) 12.83, total 98.81. The empirical formula is Na1.14(Cu1.86Fe0.14)(Cl2.99S0.23)N9.23C3.43H23.34O4.29. The idealized formula is NaCu2(N3C2H2)2(NH3)2Cl3·4H2O. Triazolite is a metalorganic ammine complex in which 1,2,4-triazolate anion and ammonia molecule are ligands coordinating Cu2+. The crystal structure was solved by direct methods and refined to R = 0.0242 based on 4210 unique reflections with I > 2σ(I). Triazolite is orthorhombic, space group P212121, a = 19.3575(5), b = 7.15718(19), c = 12.5020(4) Å, V = 1732.09(8) Å3 and Z = 4. The eight strongest reflections of the powder X-ray diffraction pattern [d, Å (I,%) (hkl)] are: 10.22 (97) (101), 6.135 (40) (011), 5.696 (17) (301), 5.182 (59) (202), 5.119 (100) (211), 4.854 (19) (400), 3.752 (16) (312, 501), 3.294 (18) (221). Triazolite is named for the presence of 1,2,4-triazolate anion.

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Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Associate Editor: Peter Leverett

References

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Triazolite, NaCu2(N3C2H2)2(NH3)2Cl3·4H2O, a new mineral species containing 1,2,4-triazolate anion, from a guano deposit at Pabellón de Pica, Iquique Province, Chile
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Triazolite, NaCu2(N3C2H2)2(NH3)2Cl3·4H2O, a new mineral species containing 1,2,4-triazolate anion, from a guano deposit at Pabellón de Pica, Iquique Province, Chile
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Triazolite, NaCu2(N3C2H2)2(NH3)2Cl3·4H2O, a new mineral species containing 1,2,4-triazolate anion, from a guano deposit at Pabellón de Pica, Iquique Province, Chile
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