File:Bulletin 799 Plate 2B Antietam Schist photomicrograph.jpg
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Summary
| Description |
English: Figure caption: Antietam Schist. Porphyroblastic biotite, a, in a dolomitic matrix. The tourmaline, t, is epigenetic. Text from the Bulletin referring to this figure: Microscopically the rock shows abundant calcite, dolomite, and biotite; some of the biotite occurs as porphyroblastic blades with inclusions of the groundmass. Quartz, albite, titanite, and pyrite are present in small amounts. Tourmaline crystals which contain inclusions of the rock minerals show that the mineral was formed as a result of pneumatolytic action subsequent to recrystallization of the rock. |
| Date | |
| Source | U.S. Geological Survey Bulletin 799, Geology of the McCalls Ferry-Quarryville District, Pennsylvania. By Eleanora Bliss Knopf and Anna I. Jonas. 1929. U.S. Government Printing Office, 156 p. ill. web version |
| Author | USGS |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 02:20, 27 June 2017 | | 681 × 478 (127 KB) | Jstuby | User created page with UploadWizard |
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