skiman1016 Posted August 23, 2018 Share Posted August 23, 2018 (edited) I found this rock just outside of Riverton, Wyoming in an area with a lot of chalcedony. I believe the surrounding material is from the Wind River formation. I am unsure if this is some sort of fossil or an interesting rock. Any information would be helpful. Edited August 23, 2018 by skiman1016 Link to comment Share on other sites More sharing options...
supertramp Posted August 23, 2018 Share Posted August 23, 2018 I think you have a rock with inosilicates crystals (amphiboles: horneblende, actinolite...?) ciao Link to comment Share on other sites More sharing options...
DPS Ammonite Posted August 23, 2018 Share Posted August 23, 2018 You have a schist with an unknown black mineral. There is a slight chance that the dark mineral that forms the radial clusters might be kyanite since it looks similar to the mica rich kyanite schist found in the Phoenix Mountains. The groundmass might have mica if it is silverish and shiny. Kyanite schist: http://rockingwiththerocks.com/phx_mts.html 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...
RyanDye Posted August 23, 2018 Share Posted August 23, 2018 4 hours ago, DPS Ammonite said: You have a schist with an unknown black mineral. There is a slight chance that the dark mineral that forms the radial clusters might be kyanite since it looks similar to the mica rich kyanite schist found in the Phoenix Mountains. The groundmass might have mica if it is silverish and shiny. Kyanite schist: http://rockingwiththerocks.com/phx_mts.html Well said, informative as usual. Link to comment Share on other sites More sharing options...
skiman1016 Posted August 23, 2018 Author Share Posted August 23, 2018 Thanks for all the help/information, I was a little skeptical myself that this was a fossil. Link to comment Share on other sites More sharing options...
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