CIPW classification

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CIPW classification [¦sē¦ī¦pē¦dəb·əl·yü ‚klas·ə·fə′kā·shən]

(petrology)

A designation for the Norm system of classifying igneous rocks; from the initial letters of the names of those who devised it: Cross, Iddings, Pirsson, and Washington.

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