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...

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...

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

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

forms. Other rock types present include: alkali basalt, nephelinite, lamprophyre, and carbonatite. Mantle xenoliths have been described from Kachchh (northwestern...

surface of the water and includes 700 meters of tholeiitic lavas and lamprophyre sheets dated to 33 million years ago. The oceanic crust around the island...

microdiamonds in the island arc of Japan are found in a type of rock called lamprophyre. Kimberlites can be found in narrow (1 to 4 meters) dikes and sills,...