The mechanical break-up or disintegration of rock into smaller fragments. . Mixture of rocks formed by tectonic disruption, such as multiple faulting , which brings disparate rock types together. Usually consists of a matrix of weak material, like shale , with hard pieces of exotic rocks, such as gneiss or igneous rocks. A rock that has undergone chemical or structural changes produced by increase in heat or pressure, or by replacement of elements by hot, chemically active fluids. All micas form flat, plate-like crystals.
Crystals cleave into smooth flakes.
In geology, a mound of organic debris or organic-rich soil created by an animal. In archeology, a mound of human refuse. A metamorphic rock that forms in one of two ways. The metamorphic rock may be heated enough to partially melt, but not completely. The molten minerals resolidify within the metamorphic rock, producing a rock that incorporates both metamorphic and igneous features.