Rhyolite Thin Section Photos. Click on any photo for a larger image. Some of the larger images may be on other web sites and will open in a new window.

Rhyolite Thin Section

rhyts_001. Rhyolite with 1-3 mm phenocrysts of sanidine, plagioclase, quartz, and, biotite in a fine-grained (<0.5mm) groundmass of the same minerals. US Geological Survey Study Collection, Smith College (USGS-64).



Rhyolite Thin Section

rhyts_002. Rhyolite from S. Vincenzo, Italy. Photo by Alessandro Da Mommio, used with permission. Quartz (rounded grains), sanidine, plagioclase, and biotite phenocrysts. The field of view is 7 mm. Visit the Rhyolite page on the Alex Strekeisen website for additional images and information.