Department of Earth and Environmental Science

Igneous Rocks:

Porphyritic Rhyolite

A felsic igneous rock, the extrusive equivalent of granite. Usually light grey or pink in color. This specimen has phenocrysts in an aphanitic groundmass (porphyritic texture).

Collections

History of the Collections

Overview of the Collections

Teaching Collections

• Teaching Demonstrations and Supplies
• Field Trip Supplies
• Earth Science Collections

Accessing the Collections

Collections Staff

Contact

Department of Earth and Environmental Science
240 S. 33rd Street
Hayden Hall
Philadelphia, PA
19104-6316

nmccann@sas.upenn.edu

(T) - 215-746-0086