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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.

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Identifiers

Type Scheme Key
name photoLibrary pcf00112
number photoLibrary 28256
batch photoLibrary btch289
number_in_book photoLibrary 112

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