Rhyolite Phase Maps. Click on any map to open the Rock Library chemical map page for the sample (the hand sample will be visible first). Use the sidebar on the page you open to navigate through the images and maps.

K-84 Phase Map

rhypm_001. Rhyolite thin section with 1-3 mm phenocrysts of sanidine (peach), plagioclase (yellow), quartz (pink), and, biotite (brown) in a fine-grained (<0.5mm) groundmass of the same minerals. US Geological Survey Study Collection, Smith College (USGS-64).