Blueschist
Videos
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
Schist
Videos
Schist is a medium-grained metamorphic rock generally derived from fine-grained sedimentary rock, like shale. It shows pronounced schistosity. This means that the rock is composed of mineral grains ea
Blueschist
…depth can only be explained in the context of plate subduction, followed by exhumation, which accounts for the rarity of this rock. Blueschists are schists typically found within orogenic belts as terranes of lithology in faulted contact with greenschist or rarely eclogite facies rocks. Blueschist, as a…
A schist showing characteristic scaly schistose texture caused by platy micas
Microscopic view of garnet-mica-schist in thin section under polarized light with a large garnet crystal (black) in a matrix of quartz and feldspar (white and gray grains) and parallel strands of mica (red, purple and brown).
View of cut garnet-mica-schist
Manhattan schist from southeastern New York State