Definition of lamprophyre in English:

lamprophyre

Syllabification: lam·pro·phyre
Pronunciation: /ˈlamprəˌfī(ə)r
 
/

noun

Geology
A porphyritic igneous rock consisting of a fine-grained feldspathic groundmass with phenocrysts chiefly of biotite.
More example sentences
  • It has also been found in silica-poor igneous rocks, such as syenite, nepheline syenite, serpentinite, and lamprophyre.
  • 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.
  • Subordinate volumes of carbonatite and lamprophyre magmas are also present.

Origin

late 19th century: from Greek lampros 'bright, shining' + porphureos 'purple'.

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