Which common group of rock forming minerals has simultaneous double substitution of Na⁺ for Ca⁺²and Si⁺⁴ for Al⁺³ in its structure and chemical formula? A) pyroxenes B) micas C) plagioclase feldspars D) carbonates

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Quizplus · Accepted Answer

Plagioclase feldspars exhibit the described simultaneous double substitution in their structure, where sodium (Na) and calcium (Ca) can substitute for each other, and silicon (Si) can be substituted by aluminum (Al). This substitution mechanism is a defining characteristic of the plagioclase feldspar group, differentiating it from other mineral groups.

Which Common Group of Rock Forming Minerals Has Simultaneous Double