Gypsum Plate

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“Determination of the optical character of biaxial crystals in sections showing the emergence of an optic axis by means of the gypsum plate.” -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)

2400×1226, 182.3 KiB

Large GIF

1024×523, 32.3 KiB

Medium GIF

640×326, 18.2 KiB

Small GIF

320×163, 7.8 KiB