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    Question

    Which mineral is considered as a secondary mineral?

    A Quartz Correct Answer Incorrect Answer
    B Feldspar Correct Answer Incorrect Answer
    C Biotite Correct Answer Incorrect Answer
    D Gibbsite Correct Answer Incorrect Answer
    E Olivine Correct Answer Incorrect Answer

    Solution

    Gibbsite (Al ₂ O ₃ ·3H ₂ O) forms from weathering of primary minerals. Quartz and feldspar are primary.

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