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King, Basil C. (1962) Optical determination of aegirine-augite with the universal stage. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (257) 132-137 doi:10.1180/minmag.1962.033.257.06

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Reference TypeJournal (article/letter/editorial)
TitleOptical determination of aegirine-augite with the universal stage
JournalMineralogical Magazine and Journal of the Mineralogical Society
AuthorsKing, Basil C.Author
Year1962 (June)Volume33
Issue257
PublisherMineralogical Society
Download URLhttps://rruff.info/doclib/MinMag/Volume_33/33-257-132.pdf+
DOIdoi:10.1180/minmag.1962.033.257.06Search in ResearchGate
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Mindat Ref. ID5678Long-form Identifiermindat:1:5:5678:0
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Full ReferenceKing, Basil C. (1962) Optical determination of aegirine-augite with the universal stage. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (257) 132-137 doi:10.1180/minmag.1962.033.257.06
Plain TextKing, Basil C. (1962) Optical determination of aegirine-augite with the universal stage. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (257) 132-137 doi:10.1180/minmag.1962.033.257.06
In(1962) Mineralogical Magazine Vol. 33 (257) Mineralogical Society
Abstract/NotesSummaryThe accurate determination of α:[001] and 2V in members of the aegirine-augite series often presents difficulties owing to strong absorption and dispersion, especially as high angles of tilt on the universal stage are often involved. Both of these angles depend on the location of α, and this operation is the one most subject to error.An alternative procedure is the determination of A:[001], the angle between an optic axis and [001]. This angle is very easily and accurately determined and varies systematically with composition. It can be derived from the values for α:[001] and 2V, while conversely values of α:[001] and 2V can be obtained from A:[001] by reference to standard curves.


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