Jpdigger Posted July 26, 2016 Share Posted July 26, 2016 Corporlite? Very gemmy with concentric red bands, some translucency like tiger eye. Dense with approx Sg of 4. 1 Link to comment Share on other sites More sharing options...
ynot Posted July 26, 2016 Share Posted July 26, 2016 Welcome to TFF. A picture would help. Tony 1 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...
DPS Ammonite Posted July 26, 2016 Share Posted July 26, 2016 Welcome to the Forum. Please send us clear photos from several angles and tell us where it came from and the name and age of the rocks. 1 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...
Jpdigger Posted July 27, 2016 Author Share Posted July 27, 2016 Trying again, I was asked to identify this but I am pretty amateur. The concentric rings around the long axis are very interesting, fine grained and natural smooth polish with some translucence. Very dense with metal and a SG approximated at 4. I am getting more info on the geologic setting, but it sure looks like poop. What do you think? What in the texture helps identify a coprolite? 1 Link to comment Share on other sites More sharing options...
ynot Posted July 27, 2016 Share Posted July 27, 2016 (edited) Welcome back, This is not coprolite. It is a mineral called hematite. It is a nice piece! Tony Edited July 27, 2016 by ynot 1 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...
doushantuo Posted July 27, 2016 Share Posted July 27, 2016 (edited) Agree with tony here,the framboidal morphology gives it away as such. Edited July 27, 2016 by doushantuo 1 Link to comment Share on other sites More sharing options...
DPS Ammonite Posted July 27, 2016 Share Posted July 27, 2016 Since there are many dark botryoidal minerals and as a double check for hematite, do a streak test. Scratch it on an unglazed tile or the underside of your toilet tank lid. If it is reddish or reddish brown it is most likely hematite. Yellowish brown is most likely goethite. 1 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...
GeschWhat Posted July 27, 2016 Share Posted July 27, 2016 (edited) I agree with the others, not a coprolite. Not an expert here, but it looks more like an agate to me, especially since you said it was somewhat translucent. Looks silica based. It is a beautiful rock. Nice find and welcome to the forum! Edited July 27, 2016 by GeschWhat 1 Lori www.areallycrappystory.com/fossils www.facebook.com/fossilpoo Link to comment Share on other sites More sharing options...
Jpdigger Posted July 27, 2016 Author Share Posted July 27, 2016 Thanks for your knowledge. What surface textures help identify coprolite? 1 Link to comment Share on other sites More sharing options...
Raggedy Man Posted July 27, 2016 Share Posted July 27, 2016 Do you know where this was found? It looks like some fire agates found in Arizona and New Mexico. 1 ...I'm back. Link to comment Share on other sites More sharing options...
GeschWhat Posted July 27, 2016 Share Posted July 27, 2016 Thanks for your knowledge. What surface textures help identify coprolite? If you are talking about the agatized (siliceous) "gem coprolite" you see on-line, it is somewhat doubtful that that is coprolite at all. Surface texture can vary. What is important to identify it as a true coprolite is often what is included inside. With siliceous coprolites, often times you have to slice into it to positively identify it. You look for things like backfilled burrows left by insects such as dung beetles, plant material or bits of bone/scales. Most coprolites that can be positively identified as such are from carnivores and are comprised primarily of calcium phosphate...the same mineral found in the bones of the animals they ingest. Location is a key factor. Coprolites from terrestrial vertebrates such as dinosaurs, are usually found near bones. You want to look for things like over all shape (morphology), sphincter marks, intestinal folds, and surface inclusions (bone/scales). If you click on the link under my name, it will take you to my website, which contains numerous examples of coprolites. Keep in mind that the site is primarily for kids and immature adults. Those labeled as "dubiocoprolites" may or may not be coprolites at all. I also have a few up there that I refer to as psuedocoprolties. Those look like coprolites, but are geological. 3 Lori www.areallycrappystory.com/fossils www.facebook.com/fossilpoo Link to comment Share on other sites More sharing options...
ynot Posted July 27, 2016 Share Posted July 27, 2016 Very few agates exhibit black, especially for the whole piece. Fire agate is a form of chalidon and usually white with brownish banding, caused by inclusions of hematite or goethite. The piece in question shows some red bands, this is because of the purity of the hematite. Pure hematite is red, the rest is black because of impurities in the structure. I stick with My original assessment-- this rock is a classic example of hematite. Tony 2 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...
JohnBrewer Posted July 27, 2016 Share Posted July 27, 2016 Thanks for your knowledge. What surface textures help identify coprolite? Have a look here for the best coprolite website I know of http://www.areallycrappystory.com/fossils And welcome to the forum John Map of UK fossil sites Link to comment Share on other sites More sharing options...
DPS Ammonite Posted July 27, 2016 Share Posted July 27, 2016 Very few agates exhibit black, especially for the whole piece. Fire agate is a form of chalidon and usually white with brownish banding, caused by inclusions of hematite or goethite. The piece in question shows some red bands, this is because of the purity of the hematite. Pure hematite is red, the rest is black because of impurities in the structure. I stick with My original assessment-- this rock is a classic example of hematite. Tony I agree with Tony that this probably is hematite. Jpdigger, as a double check, rub the rock against a concrete driveway or sidewalk to get a streak. If it is red it probably is hematite and not an agate. 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 July 27, 2016 Share Posted July 27, 2016 I think Tony is right on this one. Hematite could be. " 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...
fifbrindacier Posted July 28, 2016 Share Posted July 28, 2016 It's an amazing find. "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
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