Discussion
Foliated and non-foliated categories are given for :
Answer: C
The categories are used in metamorphic rock classification.
Metamorphic rocks are divided by texture. Foliated rocks, such as slate, schist and gneiss, have minerals aligned in layers by directed pressure. Non-foliated rocks, such as marble and quartzite, formed without strong directed stress and show no layering.
Sedimentary rocks are classified as clastic, chemical or organic, and igneous rocks as intrusive or extrusive and by silica content. Schist is a single foliated metamorphic rock, not a group being classified.
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