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Gneiss
Gneiss is a foliated metamorphic rock identified by its bands and is common and widely distributed type of metamorphic rock. It is formed by high-temperature and high-pressure metamorphic processes acting on formations composed of igneous or sedimentary rocks.
Colors It Comes In - White, Gray, Pink, Black, and Red
Fracture - Shear sliding
Shape - Variety of shapes and sizes
Luster - Shiny, Sparkly
Texture - Coarse-Grained, Interlocking
Streak - White To Light Grey
Locality - It is prevalent in areas such as the Scottish Highlands, the Alps, the Himalayas, and parts of North America. Gneisses are also common in the ancient crust of continental shields.
Where It Can Be Found - Commonly found in the cores of mountain ranges and in Precambrian crystalline terranes.
Hardness On The Mohs Scale - 6 To 7 Out Of 10
