. Bulletin of the Geological Society of America. Geology. BULL. GEOL. SOC. AM. VOL. 12, 1900, PL. 34 ». Figure 1.—Microphotograph of Kigatjd Hornblende-Syenite Dark mineral is biotite and the white is quartz. Strong allotriomorphism of biotite towards the feldspar is well shown. Ci'ossed nieols X 38. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Society of America. [New York : The Society]

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890