metamorphic rock

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metamorphic rock

[¦med·ə¦mȯr·fik ′räk]
(petrology)
A rock formed from preexisting solid rocks by mineralogical, structural, and chemical changes, in response to extreme changes in temperature, pressure, and shearing stress.

metamorphic rock

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.
References in periodicals archive ?
Dyskin, "A numerical study of flexural buckling of foliated rock slopes," International Journal for Numerical and Analytical Methods in Geomechanics, vol.
Strength and anisotropy of foliated rocks with varied mica contents.
Modally layered rocks composed of leucogabbronorite-leuconorite and anorthosite occur at just 5% of localities, and are therefore significantly less abundant than massive, mottled, and foliated rocks. At ~60-70% of the vertical extent through the Main Zone, however, modal layering occurs at an anomalously high proportion (~15%) of localities (Fig.