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金砂玉的成因金砂玉产自两广交界的黄华河流域,其原岩出露于云开大山,属广西较老的变质岩系,地质年代为元古代前震旦纪,约8亿年前。原岩为石英岩,是平政岩组中的夹层,沉积成岩后,受火成作用影响,变质成石英岩,一般属中层状,层理清晰,层面较平,有些块段,受构造运动影响,有些平缓弯曲,形成龟背状。金砂玉的矿物组成,据权威部门鉴定,其主要成分为石英,含量96%,含白云母约3%,褐铁矿约1%。石英微细,其微粒也是在0.1mm左右,多数为隐晶质,呈紧密镶嵌略具定向分布,致密块状
The cause of Jinsha jade Jinsha Jade produced from the junction of Guangdong and Guangxi Huanghe River Basin, the original rock exposed in the open mountains, is an older metamorphic rocks in Guangxi, the geological age of the Proterozoic Pre-Sinian, about 800 million years ago. The original rock is quartzite, which is a sandstone in the Pingzeng Group. After sedimentary diagenesis, it is metamorphosed into quartzite due to the effect of igneous activity. It is generally of middle-level shape with clear bedding and flat layers with some blocks, Sports effects, some gentle bent, the formation of Turtle shape. Jinsha jade mineral composition, identified by the authoritative department, the main component of quartz, 96%, containing about 3% muscovite, limonite about 1%. Quartz fine, its particles are also about 0.1mm, the majority of cryptocrystalline, was closely embedded in a slightly directional distribution, dense block