Pyroxenes in Hawaiian lavas

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ID: 305678
1944
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Abstract
Macdonald discusses Hess9 (1944) classification of pyroxenes. Macdonald believes that the gap in optic angle of monoclinic pyroxenes will be eventually found to be nonexistent. Hess9 statement that the commonest basaltic pyroxene has a 2V of about 45 degrees is not borne out by Hawaiian lavas, in which the commonest pyroxene is pigeonite with small 2V. He proposes a 2V of 32 degrees as the boundary between augite and pigeonite. The pyroxene microphenocryst in the 1840 lava of Kilauea (Macdonald, 1944a; Hess, 1944) is termed pigeonitic augite.
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Authors Graeme A. Macdonald
Journal american journal of science
Year 1944
DOI
10.2475/ajs.242.11.626
URL
https://ajs.scholasticahq.com/article/58145.pdf
Keywords Keywords not found

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