motl57 Posted August 31, 2022 Share Posted August 31, 2022 Is not crumbly and does not have any trapped air. Is very hard. I know its some kind of oxidizing iron formation, but I don't know its name. Thanks. 🙂 Link to comment Share on other sites More sharing options...
Rick N. MI Posted August 31, 2022 Share Posted August 31, 2022 It looks like Hematite. An iron ore. 2 Link to comment Share on other sites More sharing options...
Bear Posted August 31, 2022 Share Posted August 31, 2022 The texture appears to be botryoidal.  As to the mineral it could be hematite.  1 Link to comment Share on other sites More sharing options...
Gold Seeker Posted September 1, 2022 Share Posted September 1, 2022 Yes I also think it's Botryoidal Hematite or Botryoidal Goethite, Botryoidal means "grape like". 1 Link to comment Share on other sites More sharing options...
motl57 Posted September 1, 2022 Author Share Posted September 1, 2022 Thanks for all the quick replies! This is very encouraging. Link to comment Share on other sites More sharing options...
motl57 Posted September 1, 2022 Author Share Posted September 1, 2022 I think it is Botryoidal Goethite (rather than hematite) as the streak is "Yellowish brown, orange-yellow, ocher-yellow" and not "Reddish brown ('rust-red')": 2 Link to comment Share on other sites More sharing options...
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