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Kyanite interference colors. Union College Geology Department, Kurt Hollocher, Petrology course, Metamorphic minerals image gallery

Kyanite interference colors. Union College Geology Department, Kurt Hollocher, Petrology course, Metamorphic minerals image gallery

Union College Geology Department, Kurt Hollocher, Petrology course, Metamorphic minerals image gallery

Union College Geology Department, Kurt Hollocher, Petrology course, Metamorphic minerals image gallery

Staurolite in a muscovite-biotite schist. Closeup view of the end of a staurolite crystal. Cross polarized light, 100x.

Staurolite in a muscovite-biotite schist. Closeup view of the end of a staurolite crystal. Cross polarized light, 100x.

The glacially deposited sands around Lake Winnibigoshish, Minnesota, contain abundant sediments from the igneous and metamorphic minerals of the Lake Superior basin. A sample includes pink garnets, green epidote, iron-rich red agates, black magnetite, and hematite. Image Copyright © 2008 Dr. Gary Greenberg.

The glacially deposited sands around Lake Winnibigoshish, Minnesota, contain abundant sediments from the igneous and metamorphic minerals of the Lake Superior basin. A sample includes pink garnets, green epidote, iron-rich red agates, black magnetite, and hematite. Image Copyright © 2008 Dr. Gary Greenberg.

The subducted crust and mantle contains a heterogeneous distribution of hydrous metamorphic minerals. These minerals break down during subduction, producing fluids that reach the mantle wedge and cause melting of the mantle peridotite (the introduction of H2O lower the solidus)

The subducted crust and mantle contains a heterogeneous distribution of hydrous metamorphic minerals. These minerals break down during subduction, producing fluids that reach the mantle wedge and cause melting of the mantle peridotite (the introduction of H2O lower the solidus)

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