这片区域的岩石富含层状硅酸盐矿物，摸起来很滑。

The rocks in this area contain abundant ___phyllosilicates, which make them feel slippery.

云母是一种常见的层状硅酸盐矿物，常用于电气绝缘材料。

Mica, a common ___phyllosilicate, is often used in electrical insulation materials.