Respuesta :
The metamorphic textures in order of increasing metamorphic grade are:
- Salty cleavage
- Schistocity
- Banding
Foliated Textures of Metamorphic Rocks
The texture of metamorphic rocks can be either granular or foliated. This time we will only discuss the foliation texture. Foliation is a collection of planar minerals, or concentrations of minerals, especially planar structures resulting from the flattening of mineral grains, such as mica.
Most metamorphic rocks are formed due to the influence of stress in a certain direction. Therefore, we can observe a striking directional texture. Foliation itself can appear subtle or obvious depending on the degree of metamorphism.
As temperature and pressure increase, a foliated texture develops in the following sequence.
- Slaty Cleavage is the pervasive parallel foliation of fine-grained platy minerals such as chlorite in a direction perpendicular to the direction of maximum stress. This process produces slate and phyllite.
- Schistosity is the layering in coarse-grained crystalline rocks due to the parallel arrangement of platy mineral grains such as biotite, muscovite, quartz, feldspar, plus various other minerals such as garnet, kyanite, and sillimanite.
- Banding is the inner layer of rock in which bands or lenses of granular minerals such as quartz and feldspar alternate with bands or lenses in which platy minerals (mica) elongate and predominate.
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