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彭志忠石(镁尼日利亚石)是一种新矿物,除了Sn、Al外,过去发现的尼日利亚石都是以Fe、Zn为主的,而这次在湖南安化发现的,则是镁的端元矿物。矿物为三方晶系,P_(3m1),a_0=0.5692nm,c_0=1.3782nm。晶体化学式为:Mg_2(Zn,Fe,Al)_2(Sn,Fe)_2(Al,□)_(10)O_(22)(OH)_2。在全自动X射线射仪上,收集了单晶独立衍射强度数据443点进行结构计算,R=0.10。结构中氧沿c轴成…ABCACB…紧密堆积。阳离子充填四面体和八面体部分空隙,形式为…OT_2OT_1OT_0…。最后讨论了尼日利亚石—黑铝镁铁矿—塔菲石系列矿物的晶体结构和晶体化学。
Peng Zhizhong stone (magnesium Nigeria stone) is a new mineral, in addition to Sn, Al, Nigerian found in the past are based on Fe, Zn-based, and this time found in Hunan Anhua, is the magnesium terminal mineral. Minerals for the tripartite crystal system, P_ (3m1), a_0 = 0.5692nm, c_0 = 1.3782nm. The crystal chemical formula is: Mg_2 (Zn, Fe, Al) _2 (Sn, Fe) _2 (Al, □) _ (10) O_ (22) (OH) _2. On the fully automated X-ray radiometer, 443 single crystal independent diffraction intensity data were collected for structure calculation, R = 0.10. Structure along the c-axis oxygen into the ... ABCACB ... Closely packed. Cations fill tetrahedral and octahedral partial voids in the form of ... OT_2OT_1OT_0 .... Finally, the crystal structure and crystal chemistry of Nipponite-Al-Mafic-Talfite series minerals are discussed.