Definition of lamprophyre in English:

lamprophyre

noun

mass nounGeology
  • A porphyritic igneous rock consisting of a fine-grained feldspathic groundmass with phenocrysts chiefly of biotite.

    • ‘The only known igneous rocks in the area are Permian periodotite and lamprophyre dikes as well as diatremes of ultramafic composition associated with the Fluorite district.’
    • ‘Melts of these metasomites were volatile rich and hence ascended rapidly through the lithosphere, forming the lamprophyre magmas.’
    • ‘Subordinate volumes of carbonatite and lamprophyre magmas are also present.’
    • ‘It has also been found in silica-poor igneous rocks, such as syenite, nepheline syenite, serpentinite, and lamprophyre.’
    • ‘Remelting of these metasomites produced the Gardar lamprophyre magmas.’

Origin

Late 19th century: from Greek lampros ‘bright, shining’ + porphureos ‘purple’.

Pronunciation

lamprophyre

/ˈlamprəˌfʌɪə/