我们所研究的独居石产于前寒武纪沉积变质白云岩中的碳酸盐脉内,脉宽0.1—1厘米,脉中除独居石外为铁白云石、菱铁矿、磁铁矿等矿物。矿物为红褐色,板状(图1),大者长达1厘米,(001)和(100)面解理发育,硬度约5,比重5.043(比重瓶法)。薄片下无色,晶体往往染有氧化铁物质,突起高,结晶大者可看到轴面或柱面,N_g=1.850,N_m～N_p=1.795,二轴晶(+),光轴角小,最大者不超过10°。矿物虽受热至高温(1,100℃)亦不起任何变化, The monazite we studied was produced in carbonate veins of Precambrian metamorphic dolomites with a pulse width of 0.1-1 cm. The veins of the monazite in the veins are iron dolomite, siderite, magnetite, etc. mineral. The minerals are reddish-brown, plate-like (Fig. 1), the largest one centimeter, (001) and (100) face cleavage development, hardness of about 5, the proportion of 5.043 (pyknometer method). Colorless under the sheet, the crystal is often stained with iron oxide material, protrusions high, large crystals can be seen axis or cylinder, N_g = 1.850, N_m ~ N_p = 1.795, biaxial crystal (+ The maximum is not more than 10 °. Although the mineral heat to high temperature (1,100 ℃) also can not afford any change,