Metamorphic Rock Definition Is Decomposed Granite

Some form during mountain building by forces of others from the heat of igneous intrusions in regional metamorphism others from the heat of igneous intrusions in contact metamorphism.

Metamorphic rock definition is decomposed granite. Gneiss is a foliated metamorphic rock identified by its bands and lenses of varying composition while other bands contain granular minerals with an interlocking texture. Rock mass if discontinuities are widely spaced or if the intact rock material is inherently weak or altered. Rock fines ground cover for gardening and pathways model 02 0151 30 98 30 98. Metamorphic rock any rock that results from the alteration of preexisting rocks in response to changing conditions such as variations in temperature pressure and mechanical stress and the addition or subtraction of chemical components.

The word metamorphism comes from ancient greek words for change meta and form morph. Some kinds of metamorphic rocks granite gneiss and biotite schist are two examples are strongly banded or foliated. These are the rocks that form by the effects of heat pressure and shear upon igneous and sedimentary rocks. Metamorphic rocks have six basic textures or fabrics.

Set your store to see local availability add to cart. Select 2 to 4 items to compare. It is this banded appearance and texture rather than composition that define a gneiss. Metamorphic rocks are an important topic in geology.

Foliated means the parallel arrangement of certain mineral grains that gives the rock a striped appearance foliation forms when pressure squeezes the flat or elongate minerals within a rock so they become aligned. The type of rock that a metamorphic rock used to be prior to metamorphism is called the protolith. A metamorphic rock used to be some other type of rock but it was changed inside the earth to become a new type of rock. The fabric of a rock is how its particles are organized.

Metamorphic rocks table 4 3 hardness and unconfined compressive strength of rock 4 5 materials table 4 4 dry density unit weight 4 6. Other bands contain platy or elongate minerals with evidence of preferred orientation. Southwest boulder stone 0 5 cu. The preexisting rocks may be igneous sedimentary or other metamorphic rocks.