Although metamorphic rocks typically form deep in the planet’s crust, they are often exposed on the surface of the Earth. This happens due to geologic uplift and the erosion of the rock and soil above them. At the surface, metamorphic rocks will be exposed to weathering processes and may break down into sediment.

valuable, because metamorphic minerals and rocks have economic value. For example, slate and marble are building materials, garnets are used as gemstones and abrasives, talc is used in cosmetics, paints, and lubricants, and asbestos is used for insulation and fireproofing.

Lineation • The word lineation is used to describe any linear structure that occurs repetitively in a sample of rock; for example,  it may refer to an array of elongate pebbles, oriented with their long dimensions mutually parallel, or it may refer to the lines of intersection of two foliation. Diorite gneiss. 6.

Metamorphic rocks can be either smooth or rough depending on the composition present within the rock.

There are several types of lineations, intersection lineations, crenulation lineations, mineral lineations and stretching lineations being the most common. Lineation field measurements are recorded as map lines with a plunge angle and azimuth.

Foliation is the result of the parallel arrangement of (micas, etc.) in a plane perpendicular to the maximum principal applied stress. A lineation is caused by a similar growth of elongate minerals (eg. Slate, schist, and gneiss are three common foliated metamorphic rocks.

As nouns the difference between foliation and fissility is that foliation is (lb) the process of forming into a leaf or leaves while fissility is quality of being fissile.

Lineation may be formed during deformation by the parallel alignment of minerals, fossils, or pebbles; by parallel crenulation cleavages; or by striations and grooves resulting from the movement of a rock over a plane, e.g. a fault surface (see SLICKENSIDE), or flexural slip during folding.

The technique of making lines of verse that involves also the rationale for breaking the lines, whether by closure (coming to the end of the phrase, clause, or sentence at the end of the line) or by enjambment (continuing the sentence beyond the line boundary, into the next line) (Kinzie, 1999).

The crenulation lineation is the fabric element parallel to the tightly spaced hinges. Many schists exhibit this type of lineation. It generally is a good indication of superposed deformation. Rolling of some minerals during deformation may produce a wrinkling of an existing part of the foliation.