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Non-foliated metamorphic rocks, such as marble and quartzite, have randomly arranged mineral grains and lack distinct layering or foliation. Unlike foliated rocks, they do not show alignment due to the nature of their formation. The absence of layered textures is a defining characteristic of non-foliated metamorphic rocks.
Explanation:
Understanding Non-Foliated Metamorphic Rocks
In the context of metamorphic rocks, the type characterized by randomly arranged mineral grains is known as non-foliated metamorphic rocks. Unlike foliated metamorphic rocks, which have distinct layering or banding due to the alignment of minerals under directed pressure, non-foliated rocks do not exhibit any such structure. This lack of foliation means that the mineral crystals grow in various directions without preferential alignment, resulting in a massive and structureless appearance.
Examples of Non-Foliated Metamorphic Rocks
Common examples of non-foliated metamorphic rocks include:
- Marble, which is primarily composed of calcite and forms from limestone.
- Quartzite, derived from quartz-rich sandstone.
These rocks typically lack layering because they either contain a single type of mineral or their mineral grains do not deform easily when subjected to stress. As a result, they often appear visually uniform and do not break along planes of foliation.
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