The smashed with a hammer, a mineral sample breaks into smaller cubic pieces. the type of cleavage does this demonstrate Three planes of cleavage that intersect at 90°.
At 3, calcite is softer than a pocketknife but harder than a fingernail. Every mineral exhibits cleavage. Most minerals will typically break along a plane of inherent weakness when struck with a hammer. Cleavage is the term for this kind of fracture.
Rarely do minerals with good or outstanding cleavage exhibit fracture marks. More frequently than those with good or perfect cleavage, minerals with poor cleavage will fracture. Check the mineral for any cracked edges or split surfaces.
A mineral won't have any cleavage planes if its structure is uniformly strong in all directions. Instead, it will fracture or break unevenly. Fractures come in a variety of varieties.
Cleavage. Cleavage is the term used to describe how a mineral splits along flat, smooth surfaces. These fractures happen along structurally weak planes in the material. A mineral lacks cleavage, however, if it fractures along an uneven surface.
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