A greenish rock-forming mineral of the orthopyroxene class, consisting of a magnesium iron silicate.
- ‘Other associated minerals include olivine, phlogopite, enstatite (hypersthene), and many other trace accessory minerals.’
- ‘The plagioclase feldspar weathers to produce a whitish gray rock, while the mafic minerals (olivine, augite and hypersthene) produce contrasting darker grains.’
- ‘The most fundamental characteristic of tholeiites is the presence of a low-Ca pyroxene (e.g., hypersthene).’
- ‘Little-weathered grains of hypersthene and rare clasts of limestone persist throughout the profile, as evidence for limited chemical weathering.’
- ‘How about apatite, apophyllite, axinite, chlorite, hypersthene, scapolite, serpentine, tantalite, and wolframite?’
Early 19th century: coined in French, from hyper- exceeding + Greek sthenos strength (because it is harder than hornblende).
We take a look at several popular, though confusing, punctuation marks.