Mykkhul97 Posted July 18, 2018 Share Posted July 18, 2018 Hi. I believe this is from Arizona. But not sure of the origin and type of wood. Any ideas would surely help. I have many pounds if this. Please help Link to comment Share on other sites More sharing options...
ynot Posted July 18, 2018 Share Posted July 18, 2018 Welcome to TFF! The petrified wood from Arizona (mostly) comes from the Chinle formation, early triassic in age. It takes a good view of the cellular structure to identify wood. Link to comment Share on other sites More sharing options...
Mykkhul97 Posted July 18, 2018 Author Share Posted July 18, 2018 Do I need to send more pictures to verify? Why is it flat and doesn't look like other petrified wood that I have. Is it common? What can be the value of it? I have much bigger pieces of the same. Any info would be much appreciated. Thank you. Link to comment Share on other sites More sharing options...
FranzBernhard Posted July 18, 2018 Share Posted July 18, 2018 Welcome to the forum! This does not look like wood to me. But it resembles a seam or vein of minerals deposited in a crack. But I am not totally sure about this. Maybe you can ask a question at www.mindat.org Franz Bernhard 4 Link to comment Share on other sites More sharing options...
caldigger Posted July 18, 2018 Share Posted July 18, 2018 I think Franz might be on to something here. Link to comment Share on other sites More sharing options...
ynot Posted July 18, 2018 Share Posted July 18, 2018 7 hours ago, Mykkhul97 said: Do I need to send more pictures to verify? Why is it flat and doesn't look like other petrified wood that I have. Is it common? What can be the value of it? I have much bigger pieces of the same. Any info would be much appreciated. Thank you. The first piece posted does look like a vein of agate/jasper, not petrified wood. The other picture shows a piece that does look like Chinle type petrified wood, but better pictures of the three pieces would help to determine if they are all petrified wood. Setting a value is not done on TFF - against the rules. Also it is very hard to make an appraisal from pictures, to many variables in the equation. Link to comment Share on other sites More sharing options...
Mykkhul97 Posted July 18, 2018 Author Share Posted July 18, 2018 It is dense. Has grains going up and down. I don't know the gravity. Im not sure I am asking the right questions. Any help would be much appreciated. Thank you Link to comment Share on other sites More sharing options...
caldigger Posted July 18, 2018 Share Posted July 18, 2018 To me these look like Gypsum veins with mineral staining. The "Hills" East of Sharktooth Hill are full of this stuff, but in more of a translucent white/ clearish state. 1 Link to comment Share on other sites More sharing options...
FranzBernhard Posted July 18, 2018 Share Posted July 18, 2018 1 hour ago, caldigger said: To me these look like Gypsum veins with mineral staining. Thats a good guess and easily testable! Gypsum is very soft and can be scratched with a fingernail. Can you make a scratch with a fingernail? Franz Bernhard Link to comment Share on other sites More sharing options...
ynot Posted July 18, 2018 Share Posted July 18, 2018 I agree that these pieces are not petrified wood. It looks like a mineralized vein, and could be gypsum or selenite. Can You scratch it with a knife? Fingernail? copper penny? Link to comment Share on other sites More sharing options...
Mykkhul97 Posted July 18, 2018 Author Share Posted July 18, 2018 Yes. Not my fingernail but a penny did. I took better pics of these. Super hard dense pieces. Link to comment Share on other sites More sharing options...
Mykkhul97 Posted July 18, 2018 Author Share Posted July 18, 2018 More pics. Hope they work. And thanks for you work! Link to comment Share on other sites More sharing options...
ynot Posted July 18, 2018 Share Posted July 18, 2018 The last set of pictures look like jasper, which should not scratch with a copper penny or a knife. They do not look like the same as the other pieces. Would like to see a close up of the earlier pieces. Are You sure they scratched with a copper penny? Modern pennies are not copper, You need one from the 70s or earlier. Can We see pictures without the water (wet hides details.). Link to comment Share on other sites More sharing options...
Mykkhul97 Posted July 18, 2018 Author Share Posted July 18, 2018 I scratched the thinner reddish/yellow pieces. I had a feeling that those other ones were jasper. Sorry for the confusion. These are the ones I scratched with a 1975 penny and it just took some of the red color off. Didnt make a groove. I hope this helps and thank you for your patience Link to comment Share on other sites More sharing options...
Sagebrush Steve Posted July 19, 2018 Share Posted July 19, 2018 I agree that these look like mineral growths, not petrified wood. The one that looks like jasper could be petrified wood but I would say that is unlikely. As for the others, you mentioned that you don’t know their specific gravity. By measuring it, you could narrow down the choices. If you are not sure how to do this, here is a post that talks about measuring specific gravity. For objects of your size you would want to use the “vessel weight” method: Selenite has a specific gravity of 2.9 and gypsum about 2.3. Gypsum is moderately water-soluble, so you don’t want to leave it in water very long. Link to comment Share on other sites More sharing options...
FranzBernhard Posted July 19, 2018 Share Posted July 19, 2018 23 minutes ago, Sagebrush Steve said: Selenite has a specific gravity of 2.9 and gypsum about 2.3. ? - I thought selenite is a variety of gypsum? It seems that all of your specimens are too hard to be gypsum or a variety thereof. Franz Bernhard 1 Link to comment Share on other sites More sharing options...
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