Plus/minus 5.7 mm thick.  3.84 oz or 108.9 gr weight.  Fracture free. see the translucent slice of Green Chalcedony from South Africa. 

 Excellent for intarsia, cabochons and faceting. 

See pictures for size.

More of this material in my store - large chunks to very thin slices.

HB drawer 12.  #14