A porphyritic igneous rock consisting of a fine-grained feldspathic groundmass with phenocrysts chiefly of biotite.
- 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.
Late 19th century: from Greek lampros 'bright, shining' + porphureos 'purple'.
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