A Geoscience Digital Image Library

TitleHornblende schist, Gouverneur, New York
DescriptionThis is a typical metamorphosed mafic rock, being composed mostly of hornblende and plagioclase. Such rocks are sometimes termed “metabasite” or “amphibolite.” Hornblende crystals do not line up parallel or cleave in sheets as well as micas do, but still can give rocks a somewhat “schisty” character, as in this sample. The specimen is 8 cm across.
LocationUSA ▹ New York ▹ St. Lawrence. Near Gouverneur.
PhotographerNessa Eull. 2001-04-26.
CollectionWard’s University Rock Collection #189.
Key wordshornblende, schist, New York
Tech details745 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera, 60mm Nikon AF micro lens.
GeoDIL number427