of or denoting the amorphous state of a substance that has lost its crystalline structure as a result of the radioactivity of uranium or thorium within it: metamict minerals


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  • Metamodel

    noun a model that defines the components of a conceptual model, process, or system

  • Metamorphic

    [met-uh-mawr-fik] /ˌmɛt əˈmɔr fɪk/ adjective 1. pertaining to or characterized by change of form, or . 2. Geology. pertaining to or exhibiting structural change or . /ˌmɛtəˈmɔːfɪk/ adjective 1. relating to or resulting from metamorphosis or metamorphism 2. (of rocks) altered considerably from their original structure and mineralogy by pressure and heat Compare igneous, sedimentary […]

  • Metamorphic-facies

    noun 1. Geology. a group of metamorphic rock units characterized by particular mineralogic associations.

  • Metamorphic rock

    Rock that was once one form of rock but has changed to another under the influence of heat, pressure, or some other agent without passing through a liquid phase. Note: Examples are marble, which can be formed from limestone, and slate, which is formed from shale.

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