Mica Plate

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“Determination of the optical character of a uniaxial crystal with the mica plate. (a) Positive. (b) Negative.” -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)

2400×1171, 184.0 KiB

Large GIF

1024×499, 32.5 KiB

Medium GIF

640×312, 18.3 KiB

Small GIF

320×156, 7.9 KiB