Sedimentary and metamorphic rock

Sedimentary and metamorphic rocks both have economic value today. please pick a rock one of these types of rocks and discuss how it is economically important to us. where it is formed, and how it is formed. please include pictures. please use at least three sources of information and provide complete citation. One source needs to be current events from an Internet news or science website and the other form a scientific source preferable also online

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