metamorphic rock(redirected from Shale metamorphosism)
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metamorphic rock[¦med·ə¦mȯr·fik ′räk]
A rock formed from preexisting solid rocks by mineralogical, structural, and chemical changes, in response to extreme changes in temperature, pressure, and shearing stress.
Rock which has been altered in appearance, density, and crystalline structure (and in some cases mineral composition) by high temperature and/or high pressure; e.g., slate is a metamorphic rock derived from shale.