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class

A division of igneous rocks based on the relative proportions of the salic (siliceous and aluminous minerals, quartz, feldspars, and feldspathoids) and femic (ferromagnesian minerals, pyroxene, amphibole, etc.) standard normative minerals as calculated from chemical analyses.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 puntos
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