Shenzhuangite (IMA 2017-018), NiFeS2, 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, R1 and R2 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+ + Fe3+ ↔ Ni2+ + Fe2+) is ()()S2.00. The simplified formula is NiFeS2, which requires Ni 32.85, Fe 31.26, S 35.89, total 100.00 wt%. Shenzhuangite is tetragonal, space group , with unit-cell parameters: a = 5.3121(4), c = 10.4772(7) Å, V = 295.65(4) Å3, c:a = 1.9723, Z = 4. The five strongest observed X-ray powder-diffraction lines [d in Å (I/I0) (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 pS2/pO2 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.
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Research Article|
January 01, 2018
Shenzhuangite, NiFeS2, the Ni-analogue of chalcopyrite from the Suizhou L6 chondrite
Luca Bindi;
1
Dipartimento di Science de la Terra, Università degli Studi di Firenze
, Via G. La Pira, 4, 50121Firenze, Italy
2
CNR – Istituto di Geoscienze e Georisorse, Sezione di Firenze
, Via G. La Pira 4, 50121Firenze, Italy
*
Corresponding author, e-mail: luca.bindi@unifi.it
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Xiande Xie
Xiande Xie
3
Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences
, Guangzhou510640, China
4
Guangdong Provincial Key Laboratory of Mineral Physics and Materials
, Guangzhou510640, China
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European Journal of Mineralogy (2018) 30 (1): 165–169.
Article history
received:
20 Jun 2017
rev-recd:
09 Jul 2017
accepted:
10 Jul 2017
first online:
12 Jun 2018
Citation
Luca Bindi, Xiande Xie; Shenzhuangite, NiFeS2, the Ni-analogue of chalcopyrite from the Suizhou L6 chondrite. European Journal of Mineralogy 2018;; 30 (1): 165–169. doi: https://doi.org/10.1127/ejm/2017/0029-2684
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Index Terms/Descriptors
- alloys
- alteration
- cell dimensions
- chalcopyrite
- chondrites
- crystal chemistry
- crystal structure
- electron probe data
- formula
- L chondrites
- meteorites
- new minerals
- optical properties
- ordinary chondrites
- physical properties
- reflectance
- stony meteorites
- sulfidation
- sulfides
- taenite
- X-ray diffraction data
- Suizhou Meteorite
- shenzhuangite