Ultrapotassic rocks

thumb|False-color scanning electron microscope image of kimberlite from South Africa. [[Olivine crystals (green) are in a fine-grained matrix made up of clay minerals and carbonates (presented in blue, purple and buff colors).]]

thumb|Minette (a type of lamprophyre), from Jáchymov in the Czech Republic

thumb|right|Sample of lamproite Lamproite is an ultrapotassic mantle-derived volcanic or subvolcanic rock. It has low CaO, Al2O3, Na2O, high K2O/Al2O3, a relatively high MgO content and extreme enrichment in incompatible elements.

thumb|Leucogranite from Lozère, France thumb|Leucogranite of the Boscobel complex, Virginia Leucogranite is a light-colored, granitic, igneous rock containing almost no dark minerals.