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Describe important textures associated with metamorphic rock.


Arun st 6th Dec, 2019
Answer (1)
S. Saha Student Expert 6th Dec, 2019
There are two types of textures in Metamorphic Rocks and those are- Foliated and Non Foliated. Due to geological changes these types are created.

Again, Foliated ( caused by pressure) texture can be subdivided in 4 parts on the basis of increasing metamorphic grade. These types of rocks have a layered or banded appearance.
  • Slaty Texture- This texture is caused by the parallel orientation of microscopic grains.
  • Phyllitic Texture- This texture is formed by the parallel arrangement of macroscopic grains ( platy minerals, micas).
  • Schistose Texture- This texture resulting from the subparallel to parallel orientation of platy minerals such as chlorite or micas.
  • Gneissic Texture- This is a coarsely foliated texture in which the minerals have been segregated into discontinuous hands, each of which is dominated by one or two minerals.

Non Foliated- These rocks formed around igneous intrusions where the temperatures are high but the pressures are relatively low and equal in all directions. Example- Hornfels, marble, quartzite, and novaculite, do not have a layered or banded appearance.

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