Feldspar phenocrysts typically are labradorite to andesine in composition. The plagioclase ranges from oligoclase to andesine and labradorite. The andesitic lavas contain phenocrysts of andesine, hornblende, plagioclase and hypersthene. The ignimbrite contains phenocrysts consisting of biotite, hornblende, andesine plagioclase, pyroxene quartz and opaque components. Feldspar is present as plagioclase (typically oligoclase or andesine) with 10% or less alkali feldspar. Feldspar is present as plagioclase (typically oligoclase or andesine) with 10% or less potassium feldspar. The plagioclase is typically intermediate to sodic in composition, andesine to oligoclase. Andesine occurs in intermediate igneous rocks such as diorite, syenite and andesite. Andesine is a silicate mineral, a member of the plagioclase feldspar solid solution series.