EarthRef.org Reference Database (ERR) -- Macdonald 1942

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Macdonald 1942

Macdonald, G.A. (1942). Potash-oligoclase in Hawaiian lavas. American Mineralogist 27(12): 793-800.

Macdonald describes interstitial feldspar as having a small positive optic axial angle and refractive indices of oligoclase or andesine, concluding that it is soda-lime plagioclase containing a small amount of potash. He gives a table of analyses of lavas containing potash oligoclase, mostly alkalic rocks from older volcanoes.

Keywords
chemically precipitated rocks; East Pacific Ocean Islands;, evaporites; feldspar; feldspar group; framework silicates; Hawaii;, Hawaiian lavas; Lanai and Kahoolawe; lava; Oceania; oligoclase;, petrology; plagioclase; Polynesia; potash; Potash-oligoclase;, Potash-oligoclase content; sedimentary rocks; silicates; United, States, 05, Igneous and metamorphic petrology

Journal
American Mineralogist
http://www.minsocam.org/MSA/AmMin/AmMineral.html

Publisher
The Mineralogical Society of America
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