Zhangpeishanite
{{Short description|Halide mineral}}
{{Infobox mineral|boxbgcolor=#cccccc|formula=BaFCl| IMAsymbol = Zph{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}|strunz=3.DC.25|system=Tetragonal|dana=9.2.11.3|class=Ditetragonal Dipyramidal
H-M symbol: 4/mmm
(4/m 2/m 2/m)|unit cell=111.00|color=Colorless|twinning=P4/nmm|cleavage=Perfect on {001}|mohs=2.5|luster=Vitreous|opticalprop=Uniaxial (-)|refractive=nω = 1.656(2)
nε = 1.652(2)|birefringence=0.004|fluorescence=None|streak=White|gravity=4.54|density=4.54|solubility=Soluble in water|diaphaneity=Transparent}}
Zhangpeishanite is a mineral named after Zhang Peishan (Chinese: 张培善), a Chinese mineralogist at the Institute of Geology of the Chinese Academy of Sciences, in recognition of his contributions to studying the mineralogy Bayan Obo deposit, where the mineral is mined. The Bayan Obo deposit is also known for being a world class deposit. The mineral got approved by the IMA in 2006 but was published two years after its approval.{{Cite web|title=Zhangpeishanite, BaFCl, a new mineral in fluorite from Bayan Obo, Inner Mongolia, China {{!}} Shimazaki, Hidehiko; Miyawaki, Ritsuro; Yokoyama, Kazumi; Matsubara, Satoshi; Yang, Zhuming {{!}} download|url=https://ur.booksc.eu/book/22730486/089ac6|access-date=2021-08-13|website=ur.booksc.eu}} The mineral consists of barium chloride fluoride.{{cite web |title=Zhangpeishanite |url=https://www.mindat.org/min-31501.html |publisher=mindat.org |access-date=27 March 2023}}
Properties
Some of the data collected about zhangpeishanite were carried out on a synthetic equivalent of the mineral, such as cleavage and refractive index, due to zhangpeishanite's minute grain size. The mineral is isostructural with matlockite.{{Cite web|title=Zhangpeishanite|url=https://www.mindat.org/min-31501.html|access-date=2021-08-13|website=www.mindat.org}} It is a member of the matlockite group, and it is the barium dominant analogue of rorisite and matlockite. It is associated with barite, hematite, norsethite and fluorite.{{Cite web|title=Zhangpeishanite, BaFCl, a new mineral in fluorite from Bayan Obo, Inner Mongolia, China {{!}} Request PDF|url=https://www.researchgate.net/publication/238421937|access-date=2021-08-13|website=ResearchGate|language=en}} The inclusions form as bands within fluorite. The mineral occurs in fluorite as inclusions, up to 100 μm. However, they are typically much smaller, about 50 μm. It consists of barium mostly (71.21%), chlorine (18.94%) and fluorine (9.85%).{{Cite web|title=Zhangpeishanite Mineral Data|url=http://webmineral.com/data/Zhangpeishanite.shtml|access-date=2021-08-13|website=webmineral.com}} Singular crystals can be obtained at 1500 K by solid-state reaction between BaF2 and BaCl2.{{Cite book|last1=Chukanov|first1=Nikita V.|url=https://books.google.com/books?id=GOW9CwAAQBAJ&dq=Zhangpeishanite&pg=PA348|title=Infrared Spectroscopy of Minerals and Related Compounds|last2=Chervonnyi|first2=Alexandr D.|date=2016-03-09|publisher=Springer|isbn=978-3-319-25349-7|language=en}}