Blueschist
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Blueschist, also called glaucophane schist, is a metavolcanic rock that forms by the metamorphism of basalt and similar rocks at relatively low temperatures but very high pressure corresponding to a d
Blueschist on Île de Groix, France
Photomicrograph of a thin section of blueschist facies metamorphosed basalt, from Sivrihisar, Turkey
Photomicrograph of garnet-lawsonite-glaucophane blueschist from Sivrihisar, Turkey (Field of view is 3 mm)
Photomicrograph of blueschist facies quartz sediment, Sivrihisar, Turkey
Lawsonite
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Lawsonite is a hydrous calcium aluminium sorosilicate mineral with formula CaAl2Si2O72·H2O. Lawsonite crystallizes in the orthorhombic system in prismatic, often tabular crystals. Crystal twinning is
Blueschist
…corresponding to a depth of 15–30 km (9.3–18.6 mi). The blue color of the rock comes from the presence of the predominant minerals glaucophane and lawsonite. This combination of low temperature occurring at significant depth can only be explained in the context of plate subduction, followed by exhumation…
Sample from the type locality in California with two elongated, lustrous and translucent crystals of pastel pink, lawsonite in mica schist. Size: 6.1 cm × 3.2 cm × 2.5 cm (2.4 in × 1.3 in × 1.0 in)