H. H. Hess
Abstract
Hess objects to Macdonald9s (1940) classification of a microphenocryst of pyroxene with an optic angle of 45 degrees as pigeonite. He prefers the term augite, restricting pigeonite to clinopyroxene having an optic angle of 0-30 degrees . He states that the most common pyroxene in basalt has an optic angle of about 45 degrees .
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Hess objects to Macdonald9s (1940) classification of a microphenocryst of pyroxene with an optic angle of 45 degrees as pigeonite. He prefers the term augite, restricting pigeonite to clinopyroxene having an optic angle of 0-30 degrees . He states that the most common pyroxene in basalt has an optic angle of about 45 degrees .
Key concepts: Pigeonite, Augite, Pyroxene, Basalt, Geology, Mineralogy, Geochemistry, Olivine