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Examine the Mineral Composition of Metamorphic Rocks.

Everything You Need to Organize Your Specimens

Medium-grained with biotite.

Massive, chlorite-rich.

Gray to white, coarse crystalline, carbonate rock.

Classic, dark; from the Columbia Plateau.

Coarse-grained plagioclase and pyroxene with some olivine.

Fightly cemented, medium-to-coarse quartz grains.

Shiny black volcanic glass showing conchoidal fracture and some spherulites.

Gray, fine, friable, with abundant small sanidine crystal fragments.