Kluttgeharm Posted August 2, 2020 Share Posted August 2, 2020 My daughter and I found these backpacking in the yellow river forest in Iowa near the Iowa Wisconsin border on the Mississippi river. Any ideas what they are. Quote Link to comment Share on other sites More sharing options...
Guest Posted August 2, 2020 Share Posted August 2, 2020 Put a drop or two of vinegar on it... fizzes, then it is probably limestone. Quote Link to comment Share on other sites More sharing options...
Kluttgeharm Posted August 2, 2020 Author Share Posted August 2, 2020 Can limestone have Crystal's on it? We have prices that have lime small bombs that are sparkly Quote Link to comment Share on other sites More sharing options...
Kluttgeharm Posted August 2, 2020 Author Share Posted August 2, 2020 The white ones fizz but the ones like this do not. Quote Link to comment Share on other sites More sharing options...
d_day Posted August 2, 2020 Share Posted August 2, 2020 31 minutes ago, Kluttgeharm said: Can limestone have Crystal's on it? We have prices that have lime small bombs that are sparkly Limestone can exhibit crystals depending on how it formed (e.g. travertine). The others you have that don’t fizz with the vinegar may be heavily abraded agates. Quote Link to comment Share on other sites More sharing options...
Kluttgeharm Posted August 2, 2020 Author Share Posted August 2, 2020 Is there a way to confirm it is an agate. Quote Link to comment Share on other sites More sharing options...
Guest Posted August 3, 2020 Share Posted August 3, 2020 (edited) Eliminate limestone , first,no fizz, then it's more than likely an agate of some form. Can it be abraded with a steel file? Edited August 3, 2020 by Guest Quote Link to comment Share on other sites More sharing options...
d_day Posted August 3, 2020 Share Posted August 3, 2020 48 minutes ago, Kluttgeharm said: Is there a way to confirm it is an agate. Hardness will be between 7 and 7.5. Streak will be white. Specific gravity will be between 2.6 and 2.65. looking at your picture again, I think it looks more like a quartzite rather than agate. Quote Link to comment Share on other sites More sharing options...
Kluttgeharm Posted August 3, 2020 Author Share Posted August 3, 2020 I dont think it is quartzite. I found that in iowa quartzite is only in the nw part of the state. We were in the ne on the wi ia border Quote Link to comment Share on other sites More sharing options...
chrisski Posted August 3, 2020 Share Posted August 3, 2020 THose glaciers can carry rocks a long ways. Does look like some pictures of quartzite. When I think of quartzite, if the rock is split, if there’s impurities in it like other stones, it’ll split through those stones instead of around the stones. Something about the metamorphic crystalline structure being baked so long under extreme pressure changes the crystalline structure. I also thought a distinctive feature of agates was the banding, which I don’t see, but maybe it needs to be split to see those. Quote Link to comment Share on other sites More sharing options...
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