| Green augite and hypersthene form a considerable part of these rocks, they may contain also biotite, hornblende and quartz. |
| The Johnstown meteorite is classified as a calcium-poor diogenite, being composed mainly of hypersthene, with minor amounts of plagioclase and olivine. |
| On Crater Peak, and below on Gibraltar, hypersthene andesite occurs with considerable variation of color and texture. |
| The hypersthene diabase grades upward into diabase with variable texture and grain size, and is locally aplitic, granophyric or pegmatitic. |
| Little-weathered grains of hypersthene and rare clasts of limestone persist throughout the profile, as evidence for limited chemical weathering. |
| Quartz diabase grades upward into hypersthene diabase, which forms up to two-thirds of the sill thickness. |
