Photomicrograph of metamorphosed phyllite; black biotite porphyroblast developed after foliation. Washington. 1936.
Dates
Date Taken
1936
Summary
Photomicrograph of metamorphosed phyllite; black biotite porphyroblast developed after foliation. The large grain in the upper right hand corner is cordierite. Pend Oreille County, Washington. 1936. Plate 20-D, U.S.Geological Survey Professional paper 202. 1943.
Summary
Photomicrograph of metamorphosed phyllite; black biotite porphyroblast developed after foliation. The large grain in the upper right hand corner is cordierite. Pend Oreille County, Washington. 1936. Plate 20-D, U.S.Geological Survey Professional paper 202. 1943.
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