An igneous rock classification indicating an exceptionally high concentration of potassium oxide relative to sodium oxide and magnesium oxide. These rare silicate rocks, such as lamproites and kimberlites, are highly alkaline and often originate from deep mantle melting, making them significant indicators for diamond exploration.
Heard on the job
The geochemist flagged the core samples as ultrapotassic, which puts us right in the target zone for lamproite pipes.