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Mysterious Rock / Mineral

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I got this from beach and I really want to know what it is. Iam literally stumped because I am not getting any clue that what could be this . And one more notable thing is that this rock  is super solid and hard unlike its appearance  16323758879391240416778934896888.thumb.jpg.1f2c95f4e3141b4a868549dd632518ae.jpg163237593629334854114340705923.thumb.jpg.4d15afbabf6247646988cedd3a80deb8.jpg16323759678226790259756831802814.thumb.jpg.8e3534ffea14454fc2efcfbce4ee3045.jpg16323756560405791171779937261760.thumb.jpg.d0a17bcaef9d4bae15578a3c9d1782d3.jpg16323756931134231759215638737937.thumb.jpg.232a86d0d8680023633b574e052eb796.jpg

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Looks like a piece of surf-tumbled basalt to me.


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Rock collectors carry crack hammers for a reason. You need to see clean, unweather surfaces to identify questionable rocks. Only in rare cases does breaking a rock matter, so break that thing n half, and get a clear picture of the exposed surface.

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