schneiderite

例句：

1. 1.This type of chalk is commonly used in classrooms for writing and drawing.
   这种类型的粉笔常用于教室写字和绘画。
2. 2.The teacher asked the students to use talc instead of sandpaper to clean their pencils.
   老师要求学生们用滑石粉而不是砂纸来擦铅笔。
3. 3.Talc is a natural mineral that is often used as a whitening agent in cosmetics.
   滑石是一种天然矿物，经常用作化妆品的美白剂。