Crystal Movement

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“Movement of the left bar...upon rotating the stage to the right, and movement of the colored rings upon inserting a quartz wedge.” -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)

2400×635, 177.6 KiB

Large GIF

1024×270, 31.7 KiB

Medium GIF

640×169, 17.2 KiB

Small GIF

320×84, 6.6 KiB