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Identity HelpSuch an odd and peculiar rock?

14th Jan 2020 06:54 UTCShannon Gibson

02897280015789847808991.jpg
Does anyone have any idea on what in the world this is? Dahlonega, Ga

14th Jan 2020 07:17 UTCDale Foster Expert

Based solely on the picture, no.

However, it appears to be a water worn pebble comprising at least two minerals of differing hardness and resilience to abrasion.

At a guess possibly quartz for the bulk of it plus some other that is softer.

14th Jan 2020 12:28 UTCEd Clopton Expert

As Dale says, there are at least two different materials involved.  Try a quick hardness test:  scratch an inconspicuous place on the harder material with the point of a knife (Mohs hardness ~6.5 or so); if the mineral is quartz (H = 7) or something of equal or greater hardness, the knife won't scratch it.  (The knife may make a mark, but look under magnification to see whether the mark rubs off or actually left a scratch.)  Try a drop of vinegar on the softer material:  if it bubbles, it's a carbonate mineral of some kind, probably calcite.

Probability-wise, quartz is the most likely candidate for the harder mineral, but without seeing it in person it's hard to make more than a guess.  Definitely an interesting-looking rock in any case.

15th Jan 2020 02:49 UTCShannon Gibson

Thank you!
 
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