mlovasz Posted November 3, 2020 Share Posted November 3, 2020 I had this in my rock collection for quite some time. I must have thought it was a nice chunk of obsidian, years ago. I was going through my rocks with my son and found myself questioning whether this could be fossilized cancellous bone. Any insights would be most appreciated. Link to comment Share on other sites More sharing options...
DPS Ammonite Posted November 3, 2020 Share Posted November 3, 2020 You have a nice piece of volcanic glass. The solid part with conchoidal fracture is obsidian. The vuggy areas (cancellous) are pumice. Gases in the lava caused some of the obsidian to froth up and create pumice. 2 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...
mlovasz Posted November 3, 2020 Author Share Posted November 3, 2020 Thank you very much! This is a very cool rock, and I will be able to use this additional information to keep my son's interest as well as my own growing. Link to comment Share on other sites More sharing options...
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