Any of a group of chemically and physically related aluminum silicate minerals,common in igneous and metamorphic rocks,characteristically splitting into flexible sheets used in insulation and electrical equipment.

• 云母化学上和物理上有联系的铝硅酸盐矿物群的总称，常见于火成岩和变质岩中，以易裂成柔软的薄片为特征，用于绝缘体及电气设备中。