Round Thingys or Geodes... Maybe if we said geodes are purty and chert nodules aren't (unless they contain fossils)...
Terri;187974 said:So, the differences in cryptocrystalline quartz, chalcedony, chert and flint
Terri;188052 said:Solius! Having had a mineralogy course you have a better grasp than I do on this topic.
and I am just trying to translate the concepts into something simple enough to follow and relate
Sadly now, my alma mater has reduced the class to one semester!