【摘要】 <正> 一、概述长期来广大岩矿工作者习惯把无一定外形、具有胶状裂纹,正低偏中突起,全消光显微晶质的磷酸盐称为胶磷矿,它是磷块岩的主要矿物成分。1912年前认为胶磷矿是一种非晶质的磷酸盐矿物。1912年劳埃采用伦琴射线研究矿物内部结构,发现胶磷矿是结晶的非均质体,内部质点排列遵循晶体所共有的空间格子规律。随着多种先进测试手段综合运用于这种结晶质磷酸盐矿物的研究中,对其认识日趋统一。目前普遍认为胶磷矿主要是由超微粒状碳氟磷灰石组成,我们研究了贵州福泉震旦纪磷质迭层石、四川峨嵋震旦纪砂屑磷块岩和安微凤台寒武纪砾屑磷块岩中的胶磷矿,得到了相同结论。更多还原

【Abstract】 Stuolies by means of X-ray diffraction, infrared spectrometry, and scanning electron microscope show that collophanes consist of ultramicro-isoaxial granular and hexagonal prism-slaty carbonate fluorapatites, not of amorphous bodies. Lt was formerly thought that the homogeneous extinction under the cross nicol resulted from the fact that the grains of collophanes were too small for common microscopes to resolve .However, the authors of this paper ascribe the homogeneous extinction of collophanes to the disordered arrangemeut of uhramicro-granular apatites,the disparity of the orieatoctions of primary optical axes, and the subtraction of optical path difference due to the light interference under the cross nicol.更多还原