Glaucophane is a mineral that belongs to the amphibole group. It has a chemical formula of Na2(Mg,Fe)3Al2(SiO4)3O2 and a blue-grey to lavender-blue color. Glaucophane is an important mineral in metamorphic rocks, particularly in blueschist facies, which forms under high-pressure, low-temperature conditions.
Glaucophane is an important indicator of subduction zones, which are regions where one tectonic plate is being pushed beneath another plate. This is because glaucophane is stable at the high pressures and low temperatures found in subduction zones.
Glaucophane was first described in 1792 by mineralogist Josef Barth in the Alps of Austria. Its name comes from the Greek words "glaukos" meaning blue-green and "phanos" meaning appearance, in reference to its color.
Tuesday, March 14, 2023
Glaucophane
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