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本文对产于我国山东的新矿物蒙山矿(Mathiasite)进行了晶体结构精测。蒙山矿的晶体化学式为:(K、Ca、Sr)(Ti、cr、Fe、Mg、Zr)_(21)O_(38),三方晶系,空间群R,晶胞参数:a_o=10.3722,c_o=20.7161(六方定向),a_R=9.1403,a=69.187°(菱面体定向)。应用RASA-5RP自动转靶四圆单晶衍射仪,对蒙山矿收集了独立的1554个衍射强度。经结构解析和修正,求得了晶体中各原子的坐标、温度因子、占位度。并计算了原子的间距和键角。结构修正的偏离因子: R=0.047。蒙山矿产于金伯利岩中,形成于高温高压下。通过结构测定,确定了该矿物中Ti、Cr、Mg、K等元素的配位形式,特别是查明了Zr在这种以Ti为主的复杂氧化物中有独立的结晶学位置,并有缺席现象。以上研究成果丰富了金伯利岩中金属副矿物的矿物学和晶体化学内容。
In this paper, the crystal structure of the new quartz mine (Mathiasite) produced in our country is refined. The crystal chemical formula of Mengshan Mine is: (K, Ca, Sr) (Ti, Cr, Fe, Mg, Zr) _ (21) O_ (38), trigonal system, space group R, unit cell parameters: a_o = 10.3722 , c_o = 20.7161 (hexagonal orientation), a_R = 9.1403, a = 69.187 ° (rhombohedral orientation). The RASA-5RP self-turning quadrupole diffraction instrument was used to collect 1554 independent diffraction intensities for the Mengshan Mine. After structural analysis and correction, the coordinates of each atom in the crystal, the temperature factor and the occupancy degree are obtained. And calculated the atomic spacing and bond angle. Structural Correction Factor: R = 0.047. Monsanto minerals in kimberlite, formed at high temperature and pressure. Through the structure determination, the coordination forms of Ti, Cr, Mg, K and other elements in this mineral have been confirmed. In particular, Zr has been found to have independent crystallographic positions in such Ti-based complex oxides. Absence. The above research results enriched the mineralogy and crystallochemistry of metal sub-minerals in kimberlite.