A type of dark igneous rock that forms from cooled magma and contains specific mineral compositions found in geological formations.
Named after Campton, New Hampshire, where this rock type was first identified and studied in the mid-1800s; combines place name with the mineral suffix '-ite'.
Geologists literally name rocks after where they find them—this practice means that a single New Hampshire town contributed a word used worldwide whenever scientists discuss certain types of volcanic activity.
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