Lamprophyres (from Ancient Greek λαμπρός (lamprós) 'bright', and φύρω (phúrō) 'to mix') are uncommon, small-volume ultrapotassic igneous rocks primarily...

rock Lamproite – Mantle rock expulsed to the surface in volcanic pipes Lamprophyre – Ultrapotassic igneous rocks – An ultramafic, ultrapotassic intrusive...

considered "ultramafic". Ultrapotassic, ultramafic igneous rocks such as lamprophyre, lamproite and kimberlite are known to have reached the surface of the...

dikes or sills consist either of phonolite, tinguaite, lamprophyre micromalignite, lamprophyre micromelteigite, or carbonatite. The Beemerville Alkaline...

otherwise inaccessible mantle. Basalts, kimberlites, lamproites and lamprophyres, which have their source in the upper mantle, often contain fragments...

equivalent, rhyolite. Biotite is an essential phenocryst in some varieties of lamprophyre. Biotite is occasionally found in large cleavable crystals, especially...

northern apophysis, the lamprophyres and the dark inclusions. The clear-cut distinction of the microgranites and the lamprophyres from the other facies...

Several varieties of carbonatite are present in the area as well as lamprophyre, ijolite and other highly alkalic rocks. It is the type locality for...

A dike of lamprophyre near the Shiprock volcanic plug, New Mexico, that has resisted the erosion that removed some of the softer rock into which the dike...

volcanic breccia and black dikes of igneous rock called minette, a type of lamprophyre. It is the erosional remnant of the throat of a volcano, and the volcanic...