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Contents of 6.8 How are metamorphic rocks classified?

6.8 How are metamorphic rocks classified?

• Composition and texture
• We know that metamorphic processes change the minerals in a rock and often their form. Therefore, texture and composition are the primary criteria for classifying metamorphic rocks.
• The first characteristic is either foliated or non-foliated. Foliated rocks all share having layered, or otherwise linearly arranged, minerals.