A Geoscience Digital Image Library

TitleQuartz-muscovite schist, Montgomery County, Pennsylvania
DescriptionThis rock was labelled a “quartz-sericite schist” in the Ward’s Collection of Classic North American Rocks. It has, however, little schistose character because it is nearly entirely quartz. The term sericite refers to fine grained white mica, but in this rock the small amount of white mica is mostly muscovite that is easily seen with the naked eye or hand specimen. This sample is 8.5 cm across.
LocationUSA ▹ Pennsylvania ▹ Montgomery. Near Philadelphia.
PhotographerMike Davis. 2001-04-26.
CollectionWard’s University Rock Collection #191.
Key wordsquartz, sericite, schist, Pennsylvania, muscovite
Tech details678 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera, 60mm Nikon AF micro lens.
GeoDIL number429