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Amphibolite
This rock is typically dark-colored and heavy with a weakly foliated or flaky structure.
This rock is composed mainly of amphibole (as hornblende) and phagioclase feildspars, with little or no quartz.
The small flakes of black and white in the rock often give it a salt-and-pepper appearance.
This rock is named after a Greek word amphibolos, which means ambiguous because the minerals are easily mistaken for other minerals.
Amphibolite is chosen for the particular color, texture and overall look it gives to a building. Substitutes that provide a similar look include plastics and some varieties of other dark rock like dark granite.
Amphibolite is very hard rock and takes a high polish. The combination of its ability to be polished, its dark colored and the texture has made amphibolite a popular dimension stone in construction. This rock is used as paving stones and as a veneer or facing on buildings (both for interior and exterior use).
