What Phenocryst Minerals Would You Expect to Find in a Porphyritic

question 30

Multiple Choice

What phenocryst minerals would you expect to find in a porphyritic andesite?

• A) Ca- rich plagioclase and olivine
• B) muscovite and biotite
• C) intermediate (Ca- Na) plagioclase and amphibole or pyroxene
• D) Na- rich plagioclase and K- feldspar

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