A Geoscience Digital Image Library

TitleGarnet-sillimanite gneiss, Washington County, New York
DescriptionIn hand specimen this rock appears to be mostly quartz. A microscope reveals abundant fine grained garnet and sillimanite. The sillimanite can be seen in the high resolution version of this photo - it forms white needles and blades - but the garnet is ellusive. The rock may be termed a gneiss because it has bands of alternating lighter and darker color, but the banding is only weakly developed. This specimen is 10 cm across.
LocationUSA ▹ New York ▹ Washington
PhotographerMike Davis. 2001-04-26.
CollectionWard’s University Rock Collection #196.
Key wordsgarnet, sillimanite, gneiss, New York
Tech details798 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera, 60mm Nikon AF micro lens.
GeoDIL number434