Someone in the forums found a quarry in nothern Italy that is the most probable source for those
Have had this mystery stone for a while. Looks like a Thuri, but does not behave like one. It’s looks boring, no veins or streaks but give good edgesIt would be interesting if they were Italian stone
Ha! Having spoken the other day about never finding Thuris in Britain... Yesterday I found a 7 x 1.5 inch stone in the wild for pennies. After cleaning the caked oil off (welcome to Britain) I find it's a dual tone dark green-grey-black!
Photos to follow.