Unlike rocks, all minerals and are expensive, are difficult to get occur naturally, have a fixed chemical composition contain metal, dissolve in acid fracture, contain silica

Occur naturally, have a fixed chemical composition

All minerals contain one or more elements, which are pure substances that cannot be broken down into simpler substances by chemical means.

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."

the endomembrane system i think