Discussion
Orthoclase differs from plagioclase feldspar in containing
Answer: C
Correct answer: potassium rather than sodium and calcium
Orthoclase is the potassium feldspar; the plagioclases form a continuous series from sodium-rich albite to calcium-rich anorthite. All are framework silicates of the same essential structure, and the difference lies entirely in which cation balances the aluminium substitution.
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