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Identity HelpCalcified Limestone Plus Something?
7th Feb 2017 23:35 UTCRobert Darabos
First thought was calcified limestone?
It reacts very strongly to vinegar. The white part (shown better in one of the close-ups) reacts even stronger to vinegar.
I thought some parts may have been Chalcedony, because some parts don't appear to have much of a reaction when I drip vinegar directly on it. I also have no clue if chalcedony can form in limestone.
Thoughts?
8th Feb 2017 00:02 UTCBob Harman
If that, I see it all the time here in Indiana. The remaining limestone areas react with vinegar and become vuggy due to their preferential weathering. The silicified areas are chalcedony quartz like, sometimes with areas of small druzy quartz crystals lining the small paces and all relatively resistant to weathering. If fossiliferous, the invertebrate fossil remains, in the silicified areas often take on a nice polish. CHEERS.......BOB
8th Feb 2017 05:40 UTCVolkmar Stingl
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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 27, 2024 03:43:16