lamprophyre
/ˈlæmprəˌfaɪə(r)/noun
mass noun
- Geology a porphyritic igneous rock consisting of a fine-grained feldspathic groundmass with phenocrysts chiefly of biotite【地质】煌斑岩。
词源
late 19th cent.: from Greek lampros 'bright， shining' + porphureos 'purple'.