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
Keywords
quartz, rock-forming minerals, crystal optics, optical character determination, gypsum plate, biaxial crystal optical character, optic axis emergenceGalleries
Miscellaneous OpticsSource
Albert Johannsen A Key for the Determination of Rock-Forming Minerals in Thin Sections (New York, NY: John Wiley & Sons, 1908)
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