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Contact Metamorphic Rock
Contact metamorphic rock is
rarer than the regional one.
It is the type that is hardest to recognize as a metamorphic rock, because it lacks foliation and schistosity.
These are the rocks that have formed close to igneous rocks - either next to an ingeous intrusion, or lava flow.
The temperatures have been high enough that the rock has changed without any help from changing pressures. But they haven't been high enough for the rock to melt - if it did, an igneous rock would have formed. Those rocks include for example skarn and hornfels.
Skarn
Skarn. By nile red via Flickr.com
Skarn is a calcite-rich rock that is formed by contact metamorphism of limestone, often by syenite or granite intrusions. Fluids of these intrusions, in combination with limestone impurities create a complex mineralogy and skarn is known for many various minerals such as tremolite, serpentine, diopside, wollastonite, periclase, olivine, grossular garnet, and ore minerals such as galena, sphalerite, chalcopyrite and pyrite. Ore deposits are often found in skarn.
Hornfels
Hornfels. By .RGB. via Flickr.com
Hornfels forms by contact metamorphism close to igneous intrusions. It can form from different parent rock and depending on the parent rock and what minerals it has, there can be different hornfels, such as garnet hornfels, pyroxene hornfels, chiastolite hornfels, cordierite hornfels, and others. Generally they are known to be fine-grained, sometimes porphyritic, and often quite hard to identify.
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