Metamorphic Rock

Metamorphic rocks are preexisting igneous and sedimentary rocks that have been changed due to heat and pressure. This can occur due to igneous activity where the original rock (prolith) is deep underground where it is subject to high temperatures an high levels of pressure, or it can occur due to tectonic activity where friction and pressure is created in converging plates also metamorphosing the rock. Some examples of metamorphic rock are marble (from limestone and quartzite (from sandstone). Marble can range from many different colours but the marble found in Connemara is known for its unique shade of green. Quartzite can be found in Donegal but also interestingly on the peak of The Great Sugarloaf Co. Wicklow.
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Here is a photo of the unique marble found in Connemara.