| | Report (issue) | DESCRIPTIVE MINERALOGY OF PENNSYLVANIA 104 Na 2Al 2 Si3 Oi .2H 2 O; SiO 2 47.4, A1 2 O 3 26.8, Na...Na 2 O 16.3, Lenni, Delaware County. Crystals. Eyerman, 1911, 11. Composition: Analysis: Fe 2 O3 CaO...Sp.gr LOCALITIES: Berks County: Birdsboro, and Gickerville; Delaware County: Leiperville, Lenni (druses...colorless crystals), Felton's farm (Chester), and Ward's quarry; Montgomery County: Sumneytown, and Perkiomenville...cut east of Reading (probably Birdsboro), Berks County. White, Smith, 1910, 540. silky mass of radiating | | | Journal (article/letter/editorial) | MINERAL ISOGRADS IN SOUTHEASTERN PENNSYLVANIA Hucn McKrNSrRy, H araaril IJniaersity, Cambrid.ge, M...covered by the Philadelphia and Coatesville-West Chester Folios showing reported and observed occurrences..., Structural and petrologic studies in Duchess County, New York, Pt. II: G. S. A. Bulletin,47,775-850...8 . 874 MINERAL ISOGRADS IN SOUTHEASTERN PENNSYLVANIA 875 metamorphism: in the Piedmont region and...miles in the extreme southr:astern corner of Pennsylvania and includes most of the area covered by the |
|