新矿物彭志忠石及其有关矿物的电子探针研究

Electron Probe Study on the New Mineral Pengzhizhongite and its Similar Minerals

彭志忠石是一种含锡、铝、镁、铁、锌、钛等多种元素的氧化物类的新矿物,产于我国湖南省安化等地区。已发现有6H、24R两种多型。彭志忠石,6H:(Mg,Fe,Zn,A1)_4(Sn,Fe)_2(Al,□)_(10)O_(22)(OH)_2,24R:(Mg,Zn,Fe,Al)_6(Sn,Ti)_2(Al,□)_(14)O_(30)(OH)_2。彭志忠石不同于尼日利亚石,也不同于黑铝镁铁矿。矿物浅黄褐色、浅黄色、少量无色,呈六方板状晶体,空间群P3ml。电子探针定量分析成分为:SnO_218.73、MgO8.03、Al_2O_356.00、Fe_2O_38.38、SiO_21.48、ZnO4.73、MnO0.4,另外有少量H_2O^+1.88(化分),总计99.63％。

A new mineral, Penzhizhongite is an oxide of Sn, AI, Mg, Fe, Zn, Ti etc. It was collected from Anhua, Hunan in Cina. Two polytypes of Penzhizhongite are 6H and 24R.6H: (Mg, Fe, Zn, A1)4 (Sn, Fe)2 (A1, [~)t0022(OH)_,24R: (Mg, Fe, Zn, AI)6 (Sn, Fe)_, (AI, [2])14030(OH)2 Pengzhizhongite differs from nigerite and hogbomite. The mineral is light yellowish brown to light yel-low, sometimes colorless. Hexagong tabular. Its space group is P3ml. Pengzhizhogite was analyzed with elec-tron probe SnO2 18.73, MgO 8.03, A1203 56.00, F%O3 8.38, SiO2 1.48, ZnO 4.73, MnO 0.04, little amount of H20+1.88 (chemical analysis) and the sum is 99.63 %.