The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 320
The pyroxene quadri- lateral Photomicrographs of various pyroxene minerals in thin sections ( illuminated with polarized ... pyroxenes , a calcium - rich augite ( blue - red and green ) enclosed by a calcium - poor pigeonite crystal ...
The pyroxene quadri- lateral Photomicrographs of various pyroxene minerals in thin sections ( illuminated with polarized ... pyroxenes , a calcium - rich augite ( blue - red and green ) enclosed by a calcium - poor pigeonite crystal ...
Page 321
... Pyroxenes can be formed over a very wide range of tem- peratures , representing their stability in low - grade meta- morphic rocks ( subject to low temperatures and pres- sures ) , at the one extreme , and ultramafic nodules from upper ...
... Pyroxenes can be formed over a very wide range of tem- peratures , representing their stability in low - grade meta- morphic rocks ( subject to low temperatures and pres- sures ) , at the one extreme , and ultramafic nodules from upper ...
Page 322
... pyroxenes along the ferrosilite - heden bergite join . The phases of various mixtures of pure ferrosilite ( fs ) and pure hedenbergite ( hd ) are shown as a function of temperature at atmospheric pressure . Other phases , the result of ...
... pyroxenes along the ferrosilite - heden bergite join . The phases of various mixtures of pure ferrosilite ( fs ) and pure hedenbergite ( hd ) are shown as a function of temperature at atmospheric pressure . Other phases , the result of ...
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