Author Profile

Andesites, Basalts, Schists, and More

Andesite Porphyry

Dave Hirsch, Western Washington University
hirschd@geol.wwu.edu

Description of Available Specimens

How many pieces are available: Small Group of Specimens

Andesites, basalts, blueschist/greenschist (intermediate and/or mixed), arkose, 3-10mm stilpnomelane rosettes/layers in quartz, hisingerite amygdules (few mm)

Additional Information

Things I need: nepheline (hand-specimen), true blueschists, chloritoid (hand-specimen), sillimanite (hand-specimen and thin-section), cordierite (metamorphic, hand-specimen)