How would you know if you found one, a few months ago, sitting outside picking up little stones and thumb flicking them at the cat,,I notice one heavy one, took it inside to have a look in good light about 2 centimeters brasil nut shape pock marcked with little blown craters that were semi smooth, metalic by wieght and ever so slightly magnitic,,,does that fit the bill,,,? I saved it because thats what I assumed it to be,,,never collected rocks though, fossils yes Off the east coast of England " yeah rocks I guess" Ammonites , trilobites, and others,,,long time ago,, all gone now...
...
Stuff from the plasticene period , you know
..
...