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Skarn
Skarn is a very unusual contact
metamorphic rock.
Some would say that they don't belong to the group at all and are instead produced by metasomatism.
They are formed near granite intrusions like contact metamorphics, however they are formed as they come into contact with hot fluids.
More exactly, they form when sedimentary rocks such as dolomites and limestones alter when they come into contact with hot granite intrusions.
By Angel Fidalgo via Flickr.com
These generate hot fluids which carry silicon, magnesium, aluminium and iron.
By euphro via Flickr.com
Consequently, some valuable minerals form and those rocks often contain ores of zinc, lead, copper, iron, gold, tin, molybdenum and tungsten.
They are fine, medium or coarse grained.
By Maggie via Flickr.com
They are most often brown, grey or black but can vary.
They occur in small patches with minerals concentrated as lenses, nodules or radiating masses.
By Maggie via Flickr.com
They contain minerals such as epidote, magnetite, actinolite, wollastonite, pyroxene and grossular garnet.
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