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hypersthene

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hypersthene [′hī·pər‚sthēn]
(mineralogy)
(Mg,Fe)SiO3A grayish, greenish, black, or dark-brown rock-forming mineral of the orthopyroxene group, with bronzelike luster on the cleavage surface.


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Quartz diabase grades upward into hypersthene diabase, which forms up to two-thirds of the sill thickness.
3 Glass, IR-V (to be published) USNM 117083 Glass, IR-W (to be published) USNM 117084 Glass, IR-X (to be published) USNM 117085 Glass, Tektite, synthetic USNM 2213 Hornblende, Arenal Volcano, Costa Rica USNM 111356 Hornblende, Kakanui, New Zealand USNM 143956 Hypersthene, Johnstown meteorite USNM 746 Ilmenite, Ilmen Mnts.
However, Proterozoic Pielavesi granulites of central Finland, which are accompanied by hypersthene granitoids, were formed at 800[degrees]C and 5-6 kbar and show evidence for near-isobaric cooling (Holtta 1988).
 
 
 
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