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Kindly help me identify this thing found in beach Chennai, India . Size would be just 1.5 cm in diameter..across maximum size. It's shelled and has something inside it. It make a small noise when it is shaked completely closed on all sides. It's hard surface ( but " fine" texture ) to touch.

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  • $\begingroup$ Thanks for the edits. Could you explain what you mean by "fine"? It's not quite clear to me what you mean in this case. Thanks. $\endgroup$ – theforestecologist♦ Sep 12 '19 at 14:55

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