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Mineralogical ClassificationYangzhumingite (2009-017) in press
17th Apr 2011 17:16 UTCUwe Kolitsch Manager
Miyawaki, R. et al.:
Yangzhumingite, KMg2.5Si4O10F2, a new mineral in mica group from Bayan Obo, Inner Mongolia, China.
European Journal of Mineralogy
Yangzhumingite, ideally KMg2.5Si4O10F2, occurs as subhedral to euhedral platy crystals up to ca. 0.5 mm across in metamorphosed carbonate rock from Bayan Obo, Inner Mongolia, China. It is associated with dolomite, calcite, tremolite, norbergite and huanghoite-(Ce) with minor phlogopite, barite, bastnäsite-(Ce), parisite-(Ce), and fluorite. Yangzhumingite is transparent and colorless with white streak and pearly luster. It is optically biaxial (–), n = 1.532–1.537 (589 nm), and 2V = 5–10°. The hardness is 3 on Mohs’ scale (measured on a synthetic equivalent). It has a monoclinic unit cell with a = 5.249(4), b = 9.095(5), c = 10.142(5)Å , β = 99.96(6)°, V = 476.9(5)Å3, Z = 2, space group C2/m, and Dcalc. = 2.807 g/cm3. The five strongest lines in the powder XRD pattern are : (10.03, 95, 001); (3.37, 48, 022), (2.90, 49, 11–3), (2.59, 67, 13–1 200) and (2.41, 100, 13–2 201). The mean of 15 electron microprobe analyses and SIMS analysis for Li lead to the empirical formula (K0.70Li0.30Na0.01)(Mg2.48Fe0.06) (Si3.96Al0.03)O10 on the basis of 12 anions with (F + OH) = 2. Yangzhumingite is a member of the mica group (Nickel-Strunz grouping 9.EC.10), and it represents the Mg-dominant analogue of montdorite.
1st Aug 2011 23:35 UTCJeffrey de Fourestier Expert
24th May 2012 00:37 UTCPavel Kartashov Manager
25th May 2012 07:48 UTCKnut Edvard Larsen 🌟 Manager
It was recognized in a thin section of a lamproite dike crossing a granite of 1,8 Ga age. The find has been published in the University of Tromsø's popular magazine "Labyrint".
A pdf of the magazine (in Norwegian) with photos can been downloaded here ( the article is on p. 6):
http://uit.no/Content/288423/version=1/Labyrint4_2011_web.pdf
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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 26, 2024 01:40:57