ivigo Posted July 5, 2020 Share Posted July 5, 2020 I found today 4 rocks and looks like fossilized coral. All this in the same area. Can anyone help for identification? Thank you Quote Link to comment Share on other sites More sharing options...
d_day Posted July 5, 2020 Share Posted July 5, 2020 Looks like travertine to me. Quote Link to comment Share on other sites More sharing options...
ivigo Posted July 6, 2020 Author Share Posted July 6, 2020 8 hours ago, d_day said: Looks like travertine to me. Yes, may be is some kind of sedimentary rock formation but is not soft like travertine . Is hard , scratch very easy the glass. Looks like silica rock , maybe is not a coral or sponge but i believe is something similar to them. Quote Link to comment Share on other sites More sharing options...
Guest Posted July 6, 2020 Share Posted July 6, 2020 7 hours ago, ivigo said: ...scratch very easy the glass. Looks like silica rock , maybe is not a coral or sponge but i believe is something similar to them. I think it is coral or sponge fossil. A sedimentary rock would not be porous like that. Pumice would not scratch glass or have those straight lines. Only a harder mineral or rock could do that. Quote Link to comment Share on other sites More sharing options...
d_day Posted July 6, 2020 Share Posted July 6, 2020 6 hours ago, Stillweaver hillbelli said: I think it is coral or sponge fossil. A sedimentary rock would not be porous like that. Pumice would not scratch glass or have those straight lines. Only a harder mineral or rock could do that. Sedimentary rocks can be quite porous, particularly those whose deposition is from evaporation, like travertine. 1 Quote Link to comment Share on other sites More sharing options...
chrisski Posted July 6, 2020 Share Posted July 6, 2020 To me it looks like a volcanic pumice, except the rock itself seems to be more of quarts. I wonder if it formed kind of like a geode in a bubble in volcanic rock with minerals leaking in and the softer volcanic rock eroded away and left that. 1 Quote Link to comment Share on other sites More sharing options...
4meter Posted July 9, 2020 Share Posted July 9, 2020 (edited) Its not fossil corals but Quartz Boxwork or Cellular Limonite; in this case, the soluble materiel has chemical weathered away leaving only the quartz. Boxwork is associated with mineral deposits but also forms in limestone and as cave deposits. You have found some nice samples! Edited July 9, 2020 by 4meter 1 Quote Link to comment Share on other sites More sharing options...
Bedrock Bob Posted July 9, 2020 Share Posted July 9, 2020 It is not coral or sponge. Both are a system of tubes. This is not tubes at all. I would say it is boxwork quartz. It used to be a solid piece and the softer materials were dissolved leaving only the insoluble silica behind. 1 Quote Link to comment Share on other sites More sharing options...
ivigo Posted July 10, 2020 Author Share Posted July 10, 2020 Yes i believe is a boxwork quartz.You are probably right!!! Quote Link to comment Share on other sites More sharing options...
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