Origin of hypersthene
Examples from the Web for hypersthene
Some contain biotite, others augite or hypersthene; many have a small amount of quartz.
Hypersthene is not the prevailing pyroxene, and olivine is usually present, often in such abundance as to make the rock a basalt.
On Crater Peak, and below on Gibraltar, hypersthene andesite occurs with considerable variation of color and texture.
Green augite and hypersthene form a considerable part of these rocks, they may contain also biotite, hornblende and quartz.
Hypersthene (or bronzite) is characteristic of another group.