Biaxial Interference

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“A biaxial interference figure showing the emergence of an optic axis. The arrow indicates the movement taking place upon inserting a quartz wedge above the section. The mineral is augite. (+).” -Johannsen, 1908

Source

Albert Johannsen A Key for the Determination of Rock-Forming Minerals in Thin Sections (New York, NY: John Wiley & Sons, 1908)

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