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GEOREF RECORD

Shenzhuangite, NiFeS (sub 2) , the Ni-analogue of chalcopyrite from the Suizhou L6 chondrite

Luca Bindi and Xie Xiande
Shenzhuangite, NiFeS (sub 2) , the Ni-analogue of chalcopyrite from the Suizhou L6 chondrite
European Journal of Mineralogy (September 2017) 30 (1): 165-169

Abstract

Shenzhuangite (IMA 2017-018), NiFeS (sub 2) , is a new mineral species found in the shocked Suizhou L6 chondrite. The mineral is closely associated with forsteritic olivine, pyroxene, plagioclase glass (maskelynite), taenite and troilite. It is opaque, and in reflected light shenzhuangite is weakly anisotropic with light brown to greenish rotation tints. Internal reflections are absent. The reflectance COM values (air, R (sub 1) and R (sub 2) in %) are: 24.8, 26.0 (471.1 nm); 34.9, 36.2 (548.3 nm); 37.7, 39.1 (586.6 nm); 40.4, 41.1 (652.3 nm). The average result of 4 electron-microprobe analyses is Ni 22.37(55), Fe 30.87(67), Cu 10.88(22), Co 0.07(4), S 35.42(58), total 99.61 wt%. The empirical formula (based on 4 atoms pfu and assuming the crystal-chemical exchange: Cu (super +) + Fe (super 3) (super +) <--> Ni (super 2) (super +) + Fe (super 2) (super +) ) is (Ni (super 2+) (sub 0:69) Cu (super +) (sub 0.31) )(Fe (super 2+) (sub 0:69) Fe (super 3+) (sub 0:69) 0:31)S (sub 2.00) . The simplified formula is NiFeS (sub 2) , which requires Ni 32.85, Fe 31.26, S 35.89, total 100.00 wt%. Shenzhuangite is tetragonal, space group I4 (super -) 2d, with unit-cell parameters: a = 5.3121(4), c = 10.4772(7) A, V = 295.65(4) A (super 3) , c:a = 1.9723, Z = 4. The five strongest observed X-ray powder-diffraction lines [d in A (I/I (sub 0) ) (h k l)] are: 3.05 (100) (1 1 2), 1.875 (20) (2 2 0), 1.591 (25) (3 1 2, 1 1 6), 1.215 (10) (3 3 2, 3 1 6), 1.080 (10) (4 2 4). The crystal structure showed that shenzhuangite is the Ni-analogue of chalcopyrite. It likely formed as alteration of pre-existing taenite when pS (sub 2) /pO (sub 2) ratios allowed sulfurization of the FeNi metal. Shenzhuangite is named in honour of Prof. Shangyue Shen and Prof. Xiaoli Zhuang who first discovered the Ni-rich variety of chalcopyrite in the Suizhou meteorite.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 30
Serial Issue: 1
Title: Shenzhuangite, NiFeS (sub 2) , the Ni-analogue of chalcopyrite from the Suizhou L6 chondrite
Affiliation: Universita degli Studi di Firenze, Dipartimento di Science de la Terra, Florence, Italy
Pages: 165-169
Published: 20170905
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 23
Accession Number: 2017-085934
Categories: Mineralogy of non-silicatesPetrology of meteorites and tektites
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 7 tables
Secondary Affiliation: Chinese Academy of Sciences, Guangzhou Institute of Geochemistry, CHN, China
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201745
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