any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity
mica的用法和样例：
例句
用作名词 (n.)
They are mica which makes up the rest of the total rock. 这块岩中余下的黑色矿物部分就是云母。
So the dark mica in this granite should be called biotite. 那么,在这块花岗岩中的黑色云母类矿物就应当叫做黑云母了。
沪公网安备 31011502000490号
电信业务许可证编号：沪B2-20190700
