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Joanneumite, Cu(C (sub 3) N (sub 3) O (sub 3) H (sub 2) ) (sub 2) (NH (sub 3) ) (sub 2) ; a new mineral from Pabellon de Pica, Chile and the crystal structure of its synthetic analogue

Hans-Peter Bojar, Franz Walter and Judith Baumgartner
Joanneumite, Cu(C (sub 3) N (sub 3) O (sub 3) H (sub 2) ) (sub 2) (NH (sub 3) ) (sub 2) ; a new mineral from Pabellon de Pica, Chile and the crystal structure of its synthetic analogue
Mineralogical Magazine (February 2017) 81 (1): 155-166

Abstract

The new mineral joanneumite was found at Pabellon de Pica Mountain, Iquique Province, Tarapaca Region, Chile, where it occurs as violet microcrystalline aggregates up to 2 mm in size in small cracks in a gabbroic rock, which is covered by a guano deposit. Associated minerals are salammoniac, dittmarite, mohnite and gypsum. Joanneumite is non-fluorescent and the Mohs hardness is 1. The calculated density is 2.020 g cm (super -3) The infrared spectrum of joanneumite shows the frequencies of NH (sub 3) and isocyanurate groups and the absence of absorptions of H (sub 2) O molecules and OH (super -) ions. The chemical composition (electron microprobe data, the hydrogen was calculated from the structural formula, wt.%) is C 20.33, N 31.11, O 28.34, Cu 17.27, Zn 0.24, H 2.82, total 100.11. The empirical formula is Cu (sub 0.96) Zn (sub 0.01) N (sub 7.84) C (sub 5.98) O (sub 6.25) H (sub 9.96) and the idealized formula is CuN (sub 8) C (sub 6) O (sub 6) H (sub 10) with the structural formula Cu(C (sub 3) N (sub 3) O (sub 3) H (sub 2) ) (sub 2) (NH (sub 3) ) (sub 2) Due to the lack of suitable single crystals the synthetic analogue of joanneumite was prepared for the single-crystal structure refinement. The crystal structure was solved and refined to R = 0.025 based upon 1166 unique reflections with I > 2 sigma (I). Joanneumite is triclinic, space group P1, a = 4.982(1), b = 6.896(1), c = 9.115(2) A, alpha = 90.53(3), beta = 97.85(3), gamma = 110.08(3) degrees , V = 290.8(1) A (super 3) , Z = 1 obtained from single-crystal data at 100 K, which are in good agreement with cell parameters from powder diffraction data of joanneumite at 293 K: a = 5.042(1), b = 6.997(1), c = 9.099(2) A, alpha = 90.05(3), beta = 98.11(2), gamma = 110.95(3) degrees and V = 296.3(1) A (super 3) The eight strongest lines of the powder X-ray diffraction pattern are [d, A (I,%) (hkl)] 6.52 (68) (010), 5.15 (47) (011), 4.66 (21) (100, 110), 4.35 (9) (111), 3.29 (6) (120), 3.22 (7) (111), 3.140 (100) (121), 2.074 (7) (132). The crystal structure of joanneumite is identical with the structure of synthetic bis(isocyanurato)diamminecopper(II).


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 81
Serial Issue: 1
Title: Joanneumite, Cu(C (sub 3) N (sub 3) O (sub 3) H (sub 2) ) (sub 2) (NH (sub 3) ) (sub 2) ; a new mineral from Pabellon de Pica, Chile and the crystal structure of its synthetic analogue
Affiliation: Universalmuseum Joanneum, Centre of Natural History, Graz, Austria
Pages: 155-166
Published: 201702
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 16
Accession Number: 2017-048008
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
S20°54'50" - S20°54'50", W70°08'25" - W70°08'25"
Secondary Affiliation: University of Graz, AUT, AustriaTechnical University of Graz, AUT, Austria
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201726
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