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


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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2413×2400, 320.3 KiB

Large GIF

1024×1018, 49.3 KiB

Medium GIF

640×636, 28.1 KiB

Small GIF

320×318, 11.8 KiB