Gypsum Plate

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“Determination of the optical character of a uniaxial crystal with the gypsum plate when the center of the cross is beyond the field of the microscope. Quartz (+).” -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)

2400×2314, 389.7 KiB

Large GIF

1024×987, 64.2 KiB

Medium GIF

640×617, 36.4 KiB

Small GIF

320×308, 15.1 KiB