Any ID on this rock?

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Offline John Cen

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Any ID on this rock?
« on: 12/11/2015 14:23:47 »
Hey guys,

I noticed this rock was causing some ID problems on another website and was just wondering if anyone knew what it was?






Thanks,

John

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Offline RD

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Re: Any ID on this rock?
« Reply #1 on: 12/11/2015 18:58:42 »
[attachment=20461]

The regular cell pattern, ( somewhat like dimples on a golfball) , makes it looks like [fossilized] coral ...

https://en.wikipedia.org/wiki/Tabulata

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Offline John Cen

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Re: Any ID on this rock?
« Reply #2 on: 12/11/2015 19:06:58 »
Thanks for the help, maybe Stromatolite?

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Offline RD

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Re: Any ID on this rock?
« Reply #3 on: 12/11/2015 21:43:31 »
... maybe Stromatolite?

I don't think Stromatolite has regular arrays of large cells like tabulate coral.

[attachment=20463]
« Last Edit: 12/11/2015 21:53:28 by RD »

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Offline John Cen

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Re: Any ID on this rock?
« Reply #4 on: 13/11/2015 01:04:38 »
Great!

Thanks for the help,

I was also given another suggestion that it could be  type of onyx (like chalcedony that forms layers)

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Offline Bill S

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Re: Any ID on this rock?
« Reply #5 on: 13/11/2015 22:20:03 »
A hardness test should sort the coral from the chalcedony, unless, of course, the calcite has been replaced by silica. [:)]