Amphibolite
A species of Metamorphic Scientific name : Amphibolite RockType : Metamorphic
Amphibolite, A species of Metamorphic
Scientific name: Amphibolite
RockType: Metamorphic
Content
Description People often ask General Info
Photo By James St. John , used under CC-BY-2.0 /Cropped and compressed from original 
Description
Amphibolite is a common, often coarsely-speckled metamorphic rock that contains primarily amphibole and plagioclase feldspar (the former is dark, often black, and the latter is white). Because it is hard, takes a polish well, and sports a handsome pattern, amphibolite is commonly used for paving stones or building facades.
Physical Properties
Colors
Green, brown, black
Texture
NonFoliatedFoliated
Chemical Properties
People often ask
General Info
Usage
While amphibolite can be used like many other rocks for construction materials, occasionally it also contains a significant amount of garnets. The garnet mined from amphibolite then can be cut and polished for gemstones, or it can be ground into smaller pieces to be used as an abrasive.
Composition
Metamorphic rocks composed primarily of amphibole, plagioclase, with subordinate epidote, zoisite, chlorite, quartz, titanite, and accessory leucoxene, ilmenite and magnetite which have a protolith of an igneous rock are known as Orthoamphibolite. Para-amphibolite will generally have the same equilibrium mineral assemblage as orthoamphibolite, with more biotite, and may include more quartz, plagioclase, and depending on the protolith, more calcite/aragonite and wollastonite. 
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