Keystone Trap Rock Quarry, Cornog, Wallace Township, Chester Co., Pennsylvania, USA
A trap rock quarry in amphibolite gneiss (Precambrian).
Refs.:
Reed, Juliet C. (1976), Annotated Biblio. of Minerals New to the Pennsylvania List 1965-1974, The Mineralogical Society of PA, Inc.:16-17, 38-39; Lapham, Davis M. & Geyer, Alan R. (1965),Mineral Collecting in PA: 55 & (1969): 56; Montgomery, A. (May, 1966), PA Minerals (PM) (41), Keystone Newsletter; Min.Rec.: 2(1): 18-25 & 36 (Montgomery, et al). Montgomery, Arthur (Jun, 1966), PM (42), Keystone Newsletter; Hess, David F. (Jul & Aug, 1966), "The Occurrence of Axinite and Assoc. Mins. in the Keystone Trappe Rock Quarry, at Cornog," in Montgomery, PM (43) and (44); Montgomery, A. (Nov, 1968), PM(71); Lapham, David M. and Geyer, Alan R. (1969), Mineral Collecting in PA: 57;
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Map Reference: 40°4'36"N , 75°44'54"W
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Mineral List:24 entries listed. 17 valid minerals.
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