Went to Adelaide to see Dad. We did plenty of family bonding and after a few days the Old Buggar said ' let's have a day orf tomorrow!' not a question!!!!
So She who must be Obeyed and I went to the Zoo and then the Adelaide Museum. GDHBA DMP(great day had by all)(Drink more err-- Beer)
Whilst at the museum we found this piece of Pyrites called 'Pyrite Dollars or Suns'.

PYRITE DOLLAR (PYRITE SUN)
Formed in the seams between black shale and coal 300,000,000 years ago, these pyrite dollars do not appear to be fossils, but an aggregate of tiny pyrite crystals. They seem to be mostly found in America
Thanks for the cache Acko