a rock fragment foreign to the igneous rock in which it is embedded.
a fragment of rock differing in origin, composition, structure, etc, from the igneous rock enclosing it
(zěn’ə-lĭth’, zē’nə-)
a rock fragment foreign to the igneous m-ss in which it occurs. xenoliths usually become incorporated into a cooling magma body when pieces of the rock into which the magma was injected break off and fall into it. compare xenocryst.

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  • xenomorphic

    also, allotriomorphic. petrography. noting or pertaining to a mineral grain that does not have its characteristic crystalline form but has a form impressed on it by surrounding grains; anhedral. in an unusual form; having a strange form. adjective (of a mineral const-tuent of an igneous rock) not having its characteristic crystal shape because of deforming […]

  • xenon-arc

    an electric arc between two metal electrodes enclosed in a quartz bulb and contained in a xenon atmosphere, used mainly as a high-intensity light source in motion-picture projectors and studio spotlights.

  • xenon-hexafluoride

    a colorless, crystalline compound, xef 6 , that melts at 50°c to a yellow liquid, and boils at 75°c.

  • xenon-tetrafluoride

    a colorless, crystalline compound, xef 4 , prepared by heating a gaseous mixture of fluorine and xenon.

  • xenon-trioxide

    a colorless, nonvolatile solid, xeo 3 , explosive when dry: in solution it is called xenic acid.

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