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This question is an exact duplicate of:

this rock found lying on top of ground, it has dull lustre and grey color. It is harder than my fingernail and somewhat heavy in its size(3cm x 4cm x 2cm) enter image description hereenter image description here

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marked as duplicate by trond hansen, Jan Doggen, Fred, arkaia, Etienne Godin May 29 at 11:46

This question was marked as an exact duplicate of an existing question.