Uniaxial Interference

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“A positive uniaxial interference figure. The arrows indicate the movement taking place upon inserting a quartz wedge above the section.” -Johannsen, 1908


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


TIFF (full resolution)

2389×2400, 276.2 KiB

Large GIF

1019×1024, 44.7 KiB

Medium GIF

637×640, 25.3 KiB

Small GIF

318×320, 10.7 KiB