What Phenocryst Minerals Would You Expect to Find in a Porphyritic

question 7

Multiple Choice

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

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

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