Which mineral is NOT commonly listed among the minerals associated with sanidine?

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Study for the ASBOG 1 Geology Exam. Use flashcards and multiple choice questions for effective preparation. Each question includes hints and detailed explanations for better understanding. Prepare confidently for your exam!

Multiple Choice

Which mineral is NOT commonly listed among the minerals associated with sanidine?

Explanation:
Sanidine signals a felsic, silica-rich igneous environment where potassium feldspar stands alongside minerals like quartz and plagioclase feldspars, and often with muscovite as a mica. Olivine, by contrast, is a mafic/mineral that crystallizes from magnesium-iron-rich magmas and tends to be absent or scarce in rocks that host sanidine. As magma evolves toward felsic compositions, olivine is depleted and replaced by quartz and alkali feldspars, so it isn’t commonly listed with sanidine.

Sanidine signals a felsic, silica-rich igneous environment where potassium feldspar stands alongside minerals like quartz and plagioclase feldspars, and often with muscovite as a mica. Olivine, by contrast, is a mafic/mineral that crystallizes from magnesium-iron-rich magmas and tends to be absent or scarce in rocks that host sanidine. As magma evolves toward felsic compositions, olivine is depleted and replaced by quartz and alkali feldspars, so it isn’t commonly listed with sanidine.

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