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莱河矿于1976年在中国辽宁省的磁铁矿床中首次被发现,许多人对它进行过研究。该矿物为黑色、不透明,化学式为Fe_(0.58)~(2+)Fe_(1.0)~(3+)Mg_(0.03)Si_(0.96)O_4,虽然它的晶体结构近似于橄榄石,但已确定为单斜晶系,空间群为P2_1/b。本文作者利用X射线、电子探针、高分解能透过电子显微镜对该矿物进行了系统的研究,发现它具有假双晶、超结构和显微条纹结构。在它的旋进单晶照片中(precession method),沿b~*轴有1.8~。左右的开角,沿c~*轴有o.3~。左右的开角,应是接合面为(001)面的假双晶。在X射线衍射和电子衍射图中,发现该矿物沿c轴具有二倍和三倍周期的超结构,利用四圆衍射仪和最小二乘方修正方法,求出它的晶胞常数为a=4.805(2),b=10.189(9),c=5.801(3)×n,a=91.0(2),n为2或3。
The Laihe Mine was first discovered in 1976 in a magnetite deposit in Liaoning Province, China, and many people studied it. The mineral is black and opaque, and its chemical formula is Fe_ (0.58) ~ (2+) Fe_ (1.0) ~ (3+) Mg_ (0.03) Si_ (0.96) O_4. Although its crystal structure is similar to olivine, For the monoclinic system, space group P2_1 / b. The authors used X-ray, electron probe, high resolution electron microscopy of the mineral system was studied and found that it has a pseudomorphic, super-structure and microscopic stripe structure. In its precession method, there is 1.8 ~ along the b ~ * axis. About the opening angle, along c ~ * axis o.3 ~. About the opening angle, the bonding surface should be (001) plane pseudobrystal. In the X-ray diffraction and electron diffraction patterns, it was found that the mineral has a double and triple periodic super-structure along the c-axis. Using the four-circle diffractometer and the least-square method, the unit cell constants are obtained as a = 4.805 (2), b = 10.189 (9), c = 5.801 (3) × n, a = 91.0 (2) and n is 2 or 3.