地埋天珠的沁斑大致有四种形状:块状、点状、线状、放射状。放射状沁斑,大部分人叫水草沁,也有人叫鸡爪沁。一般情况下是局部玉质疏松,土壤中活性物质经过分子间隙(如果有绺裂通过绺裂)浸入,渗透到分子间隙中进行充填、沉淀、重结晶。在地埋时间足够的条件下(不被发掘),土壤中活性物质也足够时,千万次淋滤水就带来足够的或许物质浸泡、渗透,完成充填、沉淀,最后重结晶。这种沁斑呈放射状。这种沁斑一般不析出表面。这种沁斑颜色浓淡有序,在精密仪器下,可以直观观察到生成的前后顺序,颜色的层次感。图一:显微镜下状态,图二:50倍放大镜下状态,图三:手机电筒透光状态。
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