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Mineralogical ClassificationIMA 2010-010 = naquite; IMA 2010-044 = titanium
24th Nov 2015 14:22 UTCMarco E. Ciriotti Manager
▪ Shi, N., Li, G., Bai, W., Xiong, M., Yang, J., Fang, Q., Ma, Z., Rong, H. (2012): Naquite, FeSi, a New Mineral Species from Luobusha, Tibet, Western China. Acta Geologica Sinica, 86, 533-538.
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).
Reference:
▪ Fang, Q., Bai, W., Yang, J., Rong, He, Shi, N., Li, G., Xiong, M., Ma, Z. (2013): Titanium, Ti, A New Mineral Species from Luobusha, Tibet, China. Acta Geologica Sinica, 87, 1275-1280.
Abstract:
We describe the new mineral species titanium, ideally Ti, found in the podiform chromitites of the Luobusha ophiolite in Tibet, People's Republic of China. The irregular crystals range from 0.1 to 0.6 mm in diameter and form an intergrowth with coesite and kyanite. Titanium is silver grey in colour, the luster is metallic, it is opaque, the streak is grayish black, and it is non-fluorescent. The mineral is malleable, has a rough to hackly fracture and has no apparent cleavage. The estimated Mohs hardness is 4, and the calculated density is 4.503 g/cm3. The composition is Ti 99.23–100.00 wt%. The mineral is hexagonal, space group P63/mmc. Unit-cell parameters are a 2.950 (2) Å, c 4.686 (1) Å, V 35.32 (5) Å3, Z = 2. The five strongest powder diffraction lines [d in Å (hkl) (I/I0)] are: 2.569 (010) (32), 2.254(011) (100), 1.730 (012) (16), 1.478 (110) (21), and 0.9464 (121) (8). The species and name were approved by the CNMNC (IMA 2010-044).
24th Nov 2015 17:19 UTCKnut Edvard Larsen 🌟 Manager
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