Gypsum Plate
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“Determination of the optical character of a biaxial crystal in a section cut perpendicular to the acute bisectrix by means of the gypsum plate (+).” -Johannsen, 1908
Keywords
quartz, rock-forming minerals, crystal optics, acute bisectrix, optical character determination, gypsum plate, biaxial crystal optical characterGalleries
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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