许多区域变质层状矿床一方面伴生有喷气成因的燧石、碳酸盐、硫酸盐、氟化物、磷酸盐和硼酸盐,另一方面也同样发育有变质硅酸盐。 新近显微镜下和电子显微镜下研究表明:在几分之一毫米的范围内,单一矿物(如石榴石)从一颗粒至另一颗粒其组分变化可以很大;在微细层理间,石榴石等矿物的内部分带形 Many metamorphic bedded deposits are accompanied by jet-forming cherts, carbonate, sulfate, fluoride, phosphate and borate on the one hand and metamorphosed silicates on the other hand. Recent studies under the microscope and electron microscopy have shown that within a fraction of a millimeter the composition of a single mineral (such as garnet) can vary widely from one particle to another; between fine bedding, garnet Such as the internal part of the mineral shape