Yangzhumingite
Yangzhumingite is an IMA-recognized mineral species in the silicate class, with the chemical formula KMg₂.₅Si₄O₁₀F₂.
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Mica structural group.
Key properties: Mohs hardness 3; specific gravity 2.807; White streak; Pearly luster; optically biaxial.
IMA symbol Yzh, IMA status: approved, named in 2009.
Formed in metamorphosed carbonate rock in the transition zone between dolomite and slate in a rare earth-bearing deposit.
It is found associated with Dolomite, calcite, tremolite, norbergite, huanghoite-(Ce); with minor phlogopite, barite, bastnäsite-(Ce), parisite-(Ce), fluorite.
The mineral was named to honor Professor Yang Zhuming (b. 1951), mineralogist and crystallographer, for his contributions to the mineralogy of the Bayan Obo deposit.