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Amphibolite
Amphibolite is a mafic
metamorphic rock.
It forms in moderate temperatures but under high pressures.
It mostly consists of amphibole minerals, such as hornblende, actinolite, plagioclase feldspar, mica, pyroxene, calcite and sometimes large garnets.
It is one of the metamorphic facies, representing the composition of minerals that will form in any rock in similar pressures, temperatures and depths.
By Ron Schott via Flickr.com
Amphibolite forms from mafic igneous or sedimentary rocks such as greywacke, dolomite, andesite, basalt, diorite, gabbro.
It is a very hard rock, used in road building. It is medium to coarse grained, crystalline rock that can be greenish, grey or black in colour.
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