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Posted in response to Re: Re: Black agate seam in limestone strata-Saratoga WY from Bret on October 23, 2009 at 09:48:56:

Re: Re: Re: Black agate seam in limestone strata-Saratoga WY

Bret,
Aha! That kind of thinly laminated texture makes me think it may be sinter or travertine, like from hot springs. You're right, the black could be layers of silica, although there's a possibility they could be calcite. Can you scratch the black parts with a penny? If yes, it may be calcite; if no, it is likely quartz/silica.

From RockDr - October 23, 2009 at 19:03:23

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