摘要
Xieite,a new mineral,occurs in the shock vein of the Suizhou meteorite.The mineral has an ortho-rhombic structure and its space group is Bbmm.The cell parameters are a = 9.462(6),b = 9.562(9),c = 2.916(1).The crystal-chemical formula is(Fe0.87Mg0.13Mn0.01)1.01(Cr1.62Al0.25Ti0.08V0.02)1.97O4,or simply formula FeCr2O4.Stronger X-ray diffraction lines are [d(),I/Io]:(2.675,100),(2.389,20),(2.089,10),(1.953,90),(1.566,60),(1.439,15),(1.425,15),(1.337,40).Xieite is a high pressure polymorph of FeCr2O4 and formed by solid-state transformation of chromite under shock-induced high pressure and tem-perature,in association with other high-pressure minerals including ringwoodite,majorite,lingunite and tuite.The P-T condition for the formation of xieite is estimated to be 18―23 GPa and 1800―1950℃,respectively.Xieite has recently been approved by the Commission on New Minerals,Nomenclature and Classification of the International Mineralogical Association(IMA 2007-056).The mineral name,xieite,is named after Xiande Xie.
Xieite, a new mineral, occurs in the shock vein of the Suizhou meteorite. The mineral has an orthorhombic structure and its space group is Bbmm. The cell parameters are a = 9.462(6) A, b = 9.562(9) A, c = 2.916(1)A. The crystal-chemical formula is (Fe0.87Mg0.13Mn0.01)1.01(Cr1.62AI0.25Ti0.08V0.02)1.97O4, or simply formula FeCr2O4. Stronger X-ray diffraction lines are [d (A), I/Io]: (2.675, 100), (2.389, 20), (2.089, 10), (1.953, 90), (1.566, 60), (1.439, 15), (1.425, 15), (1.337, 40). Xieite is a high pressure polymorph of FeCr2O4 and formed by solid-state transformation of chromite under shock-induced high pressure and temperature, in association with other high-pressure minerals including ringwoodite, majorite, lingunite and tuite. The P-Tcondition for the formation of xieite is estimated to be 18--23 GPa and 1800--1950℃, respectively. Xieite has recently been approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (IMA 2007-056). The mineral name, xieite, is named after Xiande Xie.
基金
National Natural Science Foundation of China (Grant Nos. 40672035 and 40272028)
the Chinese Academy of Sciences (Grant No. KJCX2-SW-N20)
关键词
络铁矿
高压环境
基因多态性
矿物
xieite, chromite, high-pressure, polymorph, new mineral, shock, Suizhou meteorite