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图纹石中的“晕纹石”大类,主要见于我国西南地区的砂岩——石英砂岩类,以及某些石英岩类所形成的江河卵石中;也有少量出产在黄河及鄂、湘、赣等地区。由于来自原岩石内部的铁质成分,或卵石外部由氧化环境里,化学风化作用生成的铁质(铁锈水色素),或周边泥沙堆积物中以及土壤里的铁锈水、腐殖酸等,在砂岩、石英砂岩、石英岩内的孔隙、裂隙、层理中,不断地扩散、运移并沉淀浸染或褪色,而使
Graphite in the “halo stone ” categories, mainly seen in China’s southwestern sandstone - quartz sandstone, and some quartz rocks formed by the river pebbles; also produced a small amount of the Yellow River and Hubei, Hunan , Jiangxi and other regions. Due to the iron content from the inside of the original rock or the iron (rusty water pigment) generated by the chemical weathering in the oxidizing environment and outside the pebble, rust water and humic acid in the surrounding sediment and soil, In sandstone, quartz sandstone, quartzite within the pores, cracks, stratification, continue to spread, migration and precipitation dip or fade, leaving