A Geoscience Digital Image Library

TitleThin section of biotite granite
DescriptionThis is a cross polarized view of a biotite granite in thin section. The light to dark brown areas are the biotite and the highly birefringent pink-green area is muscovite. The striped minerals are plagioclase showing twinning. The yellowish and light gray areas without twinning are quartz.
LithostratigraphyWoodbury Granite
LocationUSA ▹ Vermont ▹ Washington. Near Barre.
PhotographerDarla Sondrol. 2001-06-29.
CollectionWard’s Collection of Classic North American Rocks #1.
Key wordsbiotite, granite, Vermont
Tech details623 KB. Thin section. Nikon FDX-35.
GeoDIL number957