KimTexan Posted February 19, 2018 Share Posted February 19, 2018 I found this a few weeks ago in the North Sulfur River and would like to know if it is a fossil of some sort or just hématite or some other iron rich material. There is a fare amount of iron rich material in the NSR, but most of it is smooth and not bumpy like this. I’m inclined to think it’s not a fossil, but would like to confirm before I discard it. Link to comment Share on other sites More sharing options...
ynot Posted February 19, 2018 Share Posted February 19, 2018 Looks concretion to Me. Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
Ludwigia Posted February 19, 2018 Share Posted February 19, 2018 Iron compound concretion. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
JarrodB Posted February 19, 2018 Share Posted February 19, 2018 Concretion Link to comment Share on other sites More sharing options...
abyssunder Posted February 19, 2018 Share Posted February 19, 2018 It looks botryoidal hematite, to me. " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
ynot Posted February 19, 2018 Share Posted February 19, 2018 2 minutes ago, abyssunder said: It looks botryoidal hematite, to me. Hematite is dark gray or black. Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted February 19, 2018 Share Posted February 19, 2018 It can be reddish: But I agree, the OPs specimen isn't haematite. Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
abyssunder Posted February 19, 2018 Share Posted February 19, 2018 14 hours ago, KimTexan said: There is a fare amount of iron rich material in the NSR, but most of it is smooth and not bumpy like this. At least it is botryoidal. " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
KimTexan Posted February 20, 2018 Author Share Posted February 20, 2018 Thank you all for your comments. I knew it didn’t look quite like hématite, but I don’t know what you call this type of stone. So I called it hematite for the iron rich content. Although it isn’t that iron rich, because a magnet isn’t attracted to it. I see a lot of iron sandstone and it is grainy, but this didn’t have the grain. I also collect concretions and nodules from my travels around the U.S. and it doesn’t look like any of the iron nodules or concretion I have. It has 2 plains of symmetry. The plain of symmetry on the bottom has a raised section, like a bar running down the middle (first pic). The top side has two raised ridges running down either side of it parallel to one another. The lines on opposite sides are perpendicular to one another, so it doesn’t fit the typical concretion either. It’s a different sort of rock. Link to comment Share on other sites More sharing options...
DPS Ammonite Posted February 20, 2018 Share Posted February 20, 2018 It looks like it may be altered pyrite crystals, possibly limonite. Pyrite occurs in the area. What color is the streak! My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
abyssunder Posted February 20, 2018 Share Posted February 20, 2018 It could be a Marcasite nodule or altered to Goethite (pseudomorph after Pyrite). Marcasite and Pyrite have black streak, Goethite has a brown yellowish streak, if I'm not wrong. " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
KimTexan Posted February 23, 2018 Author Share Posted February 23, 2018 On 2/20/2018 at 1:08 AM, DPS Ammonite said: It looks like it may be altered pyrite crystals, possibly limonite. Pyrite occurs in the area. What color is the streak! I’m not sure what streak you refer too, but overall the surface of the piece is reddish brown to dark brown and the interior is black. Link to comment Share on other sites More sharing options...
Kane Posted February 23, 2018 Share Posted February 23, 2018 1 minute ago, KimTexan said: I’m not sure what streak you refer too, but overall the surface of the piece is reddish brown to dark brown and the interior is black. One way of determining the identify of some rocks is to use the streak test. Run the rock along unglazed porcelain (for example, underneath the toilet tank lid) and note its colour. Hematite would show a reddish-brown streak. ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
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