G Gergelyovics Joined Jan 10, 2019 Messages 12 Reaction score 8 May 24, 2019 #1 Any one know what are them? From South beach
G Goldfinger76 Joined Aug 30, 2015 Messages 12 Reaction score 3 May 24, 2019 #2 Are they hard or chalky ?
U user 4386 Joined Jan 10, 2015 Messages 4,755 Reaction score 5,941 May 24, 2019 #4 Concretions, probably silica-rich
T travelergold Joined May 19, 2015 Messages 270 Reaction score 365 May 25, 2019 #5 I would say stones.
U user 4386 Joined Jan 10, 2015 Messages 4,755 Reaction score 5,941 May 25, 2019 #6 Clearly concretions involving layers of iron oxides and cherty silica (chalcedony), Not a single mineral, but rock replaced by these things. Because they are hard, they weather out of the rock as spheres.
Clearly concretions involving layers of iron oxides and cherty silica (chalcedony), Not a single mineral, but rock replaced by these things. Because they are hard, they weather out of the rock as spheres.
