Glaucophane is a mineral belonging to the amphibole group, chemical formula Na2(Mg,Fe)3Al2Si8O22(OH)2. It is named from its typical blue color (in Greek, glaucophane means "blue appearing"). Glaucophane crystallizes in the monoclinic system.
The blue color is very diagnostic for this species. It, along with the closely related mineral riebeckite are the only common amphibole minerals that are typically blue. Glaucophane forms a solid solution series with ferroglaucophane ; Na2(Fe,Mg)3Al2Si8O22(OH)2. Glaucophane is the magnesium-rich member and ferroglaucophane is the iron-rich member. Ferroglaucophane is similar to glaucophane but is denser, generally darker in color with a diminished pearly luster. Glaucophane's hardness is 5 - 6, and its specific gravity is approximately 3 - 3.2.
Glaucophane forms in metamorphic rocks that are either particularly rich in sodium or that have experienced low temperature-high pressure metamorphism such as would occur along a subduction zone. This material has undergone intense pressure and moderate heat as it was subducted downward toward the mantle. It is glaucophane's color that gives the blueschist facies its name. Glaucophane is also found in eclogites that have undergone retrograde metamorphism.
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