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Could anyone help me identify this mineral (pics included)

0 votes

Hey i found this stone in North Carolina. The stone is hexagonal and very hard, over a 7(scratches quartz) its heavy and streaks white. it is translucent and the back side has some transparent spots.alt textalt textalt text]alt text

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asked Dec 20, 2014 by rockhound (120 points)

3 Answers

0 votes

Not many harder than quartz, perhaps corundum, could be chalcedony.

answered Dec 22, 2014 by Weasel (58,980 points)

thanks. does chalcedony form into a large single hexagonal crystals, like this one?

0 votes

Its got the right shape, with a waterworn hexagonal outline. Did you find this in a gravel / stream area known to produce sapphire (i.e. the Missouri River area in Montana)? Sapphire/Corundum is easy to identify with a hardness test as it will scratch virtually anything else, being one of the hardest substances in existence.

answered Dec 23, 2014 by hershel (52,820 points)

Hey Hershel, thank you for your help. I found it in a long gravel deposit, at the bottom of a hill. To my knowledge the area isnt known to produce sapphires. The stone scratches quartz and everything else i have tried and i cant put a scratch on it, But i dont have a known mineral above quartz that i can use to test it.

0 votes

If you scratch it with quartz, will it resist the scratch? See if you can get hold of an inexpensive black tourmaline or garnet to test for a greater hardness.

My suggestion would be to further scout the area and see if you can find its non-alluvial source. When it comes to minerals, usually where there is one there is more.

answered Dec 24, 2014 by hershel (52,820 points)

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