Cleavage, in mineralogy, is the tendency of crystalline materials to split along definite crystallographic structural planes. These planes of relative weakness are a result of the regular locations of atoms and ions in the crystal, which create smooth repeating surfaces that are visible both in . A mineral is, broadly speaking, a solid chemical compound that occurs naturally in pure form. Minerals are most commonly associated with rocks due to the presence of minerals within rocks. These rocks may consist of one type of mineral, or may be an aggregate of two or more different types of minerals, spacially segregated into distinct phases.
A cleavage plane is a plane of structural weakness along which a mineral is likely to split anewplace.infoge thus refers to the splitting of a crystal between two parallel atomic planes. Cleavage is the result of weaker bond strengths or greater lattice spacing across the plane in question than in other directions within the crystal. Cleavage refers to the way some minerals break along certain lines of weakness in their structure. Mica is a good example – breaking along very closely spaced flat planes that yield thin "sheets." Calcite is another good example, breaking along three different planes that yield blocky fragments that look like a rectangular box that has been warped – called a "rhombohedron" or, simply.
Cleavage of Minerals the ability of most minerals to break in certain directions yielding plane surfaces. Cleavage is a property related to characteristics of the mineral’s crystal structure. The cleavage planes are parallel to the lattice planes most densely packed with atoms, that is, planes with the greatest reticular density; the binding force. Cleavage is the tendency of a mineral to break along smooth planes parallel to zones of weak bonding. Fracture is the tendency of a mineral to break along curved surfaces without a definite shape. These minerals do not have planes of weakness and break irregularly. See the picture below.
Apr 09, · This video describes the different cleavages minerals may have and how to identify them. The Mineral Identification Key: Table IIIA Hardness greater than 5½ but less than 7; Cleavage prominent (Can not be scratched by a knife, can be scratched by quartz.) Only common mineral in which the hardness is so notably different along its length vs. across its width.