“The (001) plane of an orthoclase crystal.” -Johannsen, 1908
Albert Johannsen A Key for the Determination of Rock-Forming Minerals in Thin Sections (New York, NY: John Wiley & Sons, 1908)
1882×2400, 195.6 KiB
802×1024, 25.3 KiB
501×640, 15.4 KiB
250×320, 6.8 KiB