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माणिक्य (रूबी) और नीलम (सफायर) किस तत्व के ऑक्साइड के खनिज रूप हैं?

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माणिक्य (रूबी) और नीलम (सफायर) किस तत्व के ऑक्साइड के खनिज रूप हैं?

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माणिक्य (रूबी) और नीलम (सफायर) किस तत्व के ऑक्साइड के खनिज रूप हैं?

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