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need help identifying this "rock"

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dragan986 (OP)

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need help identifying this "rock"

« on: 13/04/2015 17:04:13 »

i found this strange looking "rock". it looks interesting, so i would like to know what it is. [

] if someone know [

]

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« Last Edit: 13/04/2015 17:06:12 by dragan986 »

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Bill S

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Re: need help identifying this "rock"

« Reply #1 on: 14/04/2015 12:50:31 »

Hi Dragan, welcome.

How hard is it? Can you, for example, scratch it with a good quality knife blade?

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Bass

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Re: need help identifying this "rock"

« Reply #2 on: 15/04/2015 02:37:03 »

Conchoidal fracture suggest this is either chalcedony- microcrystalline quartz- (agate, opal, jasper) or glass. My vote is for chalcedony- which you shouldn't be able to scratch with a knife.

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dragan986 (OP)

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Re: need help identifying this "rock"

« Reply #3 on: 15/04/2015 16:24:51 »

Its very hard to scrach, it looks like glass, its transparent, but inside is something brownish.
P.S. Sorry for bad english

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