Plagioclase Feldspars

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“Cross-sections at right angles to both (001) and (010) showing (+) and (-) character of extinction in plagioclase feldspars.” -Johannsen, 1908

Keywords

rock-forming minerals, crystal cross-section, crystal right angles, 001, 010, positive character of extinction, negative character of extinction, plagioclase feldspars

Galleries

Chemical Elements and Compounds

Source

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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