The andesitic lavas contain phenocrysts of andesine, hornblende, plagioclase and hypersthene. In Canada, the batholith consists of rocks ranging from hypersthene quartz gabbro to albite granite. Basalt taken from the volcano contained pyroxene, hypersthene material, and feldspars. The rocks contain hornblende, hypersthene, and plagioclase, with additional olivine in the phreatomagmatic deposits. The most abundant minerals are hypersthene (a pyroxene) and olivine. Augite, hypersthene, labradorite, olivine and pyroxene are minerals found in Nemo lavas. Augite, hypersthene and plagioclase are also present, with smaller contents of olivine and quartz. The Mazama ash includes plagioclase, hypersthene, magnetite, hornblende, clinopyroxene, and volcanic glass. The dominant phenocrysts are zoned plagioclase, hypersthene, calcic clinopyroxene, titanomagnetite, and rimmed olivine. Some of the lava flows also contain hypersthene basalt. For example, andalusite could be associated with cordierite but never with hypersthene. Hypersthene is a common rock-forming inosilicate mineral belonging to the group of orthorhombic pyroxenes.