Rock Types: Igneous, Sedimentary, and Metamorphic Rocks Explained Posted: March 12, 2025 | Last updated: March 12, 2025 This 1930s educational film explores the natural landscapes, geological ...

SAPPHIRINE is a principal constituent of certain high grade silica-deficient metamorphic rocks at Fiskenaesset, West Greenland, where it occurs with cordierite, corundum, anorthite and biotite.

Scientists don’t yet know why. Additionally, the Martian rocks contain spinel, a mineral found in igneous and metamorphic ...

His research interests range from the evolution of metamorphic rocks in Montana and Greece to atomic diffusion measurements in the experimental petrology lab (“cooking rocks”). A common theme of his ...