Rock Forming Minerals – June 20

Rock-forming minerals comprise the bulk of the earth. By this definition, Earth’s most common mineral is brigdmanite, constituting perhaps 38% of the planet by volume. Bridgmanite is however unstable under room conditions, which makes it a serious challenge for the systematic collector to keep a piece around. This update features amphibole group minerals, pyroxene group minerals, spinel group minerals, epidote group minerals, and a few exotic species.

This gallery contains 20 specimens.