Naquite,FeSi, a New Mineral Species from Luobusha,Tibet, Western China |
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| Authors: | SHI Nicheng BAI Wenji LI Guowu XIONG Ming YANG Jingsu MA Zhesheng RONG He |
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| Institution: | 1. Crystal Structure Laboratory, China University of Geosciences, Beijing 100083, China;2. Institute of Geology, CAGS, Beijing 100037, China |
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| Abstract: | A new mineral species, named naquite(FeSi), is found in the podiform chromitites of the Luobusha ophiolite in Qusong County, Tibet, China. The detailed composition is Fe 65.65, Si 32.57 and Al 1.78 wt%. The mineral is cubic, space group P213. The irregular crystals range from 15 to 50 μm in diameter and form an intergrowth with luobusaite. Naquite is steel grey in color, opaque, with a metallic lustre and gives a grayish‐black streak. The mineral is brittle, has a conchoidal fracture and no apparent cleavage. The estimated Mohs hardness is 6.5, and the calculated density is 6.128 g/cm3. Unit‐cell parameters are a 4.486 (4) Å, V 90.28 (6) Å3, Z= 4. The five strongest powder diffraction lines d in Å (hkl) (I/I0)] are: 3.1742 (110) (40), 2.5917(111) (43), 2.0076 (210) (100), 1.8307 (211) (65), and 1.1990 (321) (36). Originally called ‘fersilicite’, the species and new name have now been approved by the CNMNC (IMA 2010–010). |
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| Keywords: | new mineral fersilicite chromite Luobusha ophiolite Tibet |
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