himmelangst Posted April 9, 2021 Share Posted April 9, 2021 Please help me ID this columnar, botryoidal (?) burgundy and camouflage fan? Purchased from an estate sale in Tacoma, Wa. Very brittle material, hardness varies 6/7. 5” x 5” 2.5 lbs. thank you!! Link to comment Share on other sites More sharing options...
Fossildude19 Posted April 9, 2021 Share Posted April 9, 2021 These look a bit like Cone-in-Cone structures. 2 1 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
DPS Ammonite Posted April 9, 2021 Share Posted April 9, 2021 I think that the piece which has a botryoidal top and gently curved surface is part of a large spheroid. It is unclear if the entire spheroid was a solid spherulite or a partially hollow lithophysa since it is not all present. Both can have the converging radial fibers that are microscopic crystals of feldspar, quartz or quartz polymorphs. https://en.m.wikipedia.org/wiki/Lithophysa 3 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...
himmelangst Posted April 9, 2021 Author Share Posted April 9, 2021 25 minutes ago, DPS Ammonite said: I think that the piece which has a botryoidal top and gently curved surface is part of a large spheroid. It is unclear if the entire spheroid was a solid spherulite or a partially hollow lithophysa since it is not all present. Both can have the converging radial fibers that are microscopic crystals of feldspar, quartz or quartz polymorphs. https://en.m.wikipedia.org/wiki/Lithophysa So basically a giant thunderegg? Can basalt form this way? Link to comment Share on other sites More sharing options...
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