Featured Item
Charnockite
This particular charnockite has been described, with analyses by deWaard and Romey, "Petrogenetic Relationships in the Anorthosite-Charnockite Series…
Featured Collection
(GC) Grand Canyon Stratigraphic Suite -- Grand Canyon, Arizona
This collection contains 21 samples. They are a representation of samples of lithology from the early precambrian to the late permian. The…