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igneous |
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Said of a rock or mineral that solidified from molten or partly molten
material, i.e., from a magma; also, applied to processes leading to,
related to, or resulting from the formation of such rocks. Igneous rocks
constitute one of the three main classes into which rocks are divided, the
others being metamorphic and sedimentary. Etymol: Latin ignis, fire.
See also: magmatic; plutonic; pyrogenic; hypabyssal; extrusive.
AGI
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