G EOL 2312 I GNEOUS AND M ETAMORPHIC P ETROLOGY Lecture 2 Classification of Igneous Rock or How...

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“E SSENTIAL ” M INERALS DARK MINERALS Melanocratic Mafic Minerals LIGHT MINERALS Leucocratic Felsic Minerals Color Index-CI =% Dark Minerals Synonymous – Terms Synonymous Terms Acid Basic Spinel