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नीलम (Sapphire) और माणिक्य (Ruby) मुख्य रूप से किस तत्व के ऑक्साइड के खनिज रूप हैं?

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नीलम (Sapphire) और माणिक्य (Ruby) मुख्य रूप से किस तत्व के ऑक्साइड के खनिज रूप हैं?

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नीलम (Sapphire) और माणिक्य (Ruby) मुख्य रूप से किस तत्व के ऑक्साइड के खनिज रूप हैं?

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