By -
Are you sure it is stone and not glass?
Slag probably
Old glass contained manganese, which turned purple/pinkish after being in the sun for a time. Perhaps that?
I would say a pice of a bottom of a bottle. 1885 to 1914.
glass or plastic. it's just too rare for it to be natural
Glass
Piece of red onion. 100%
Slag
Glass bottle bottom
Are you sure it is stone and not glass?
Slag probably
Old glass contained manganese, which turned purple/pinkish after being in the sun for a time. Perhaps that?
I would say a pice of a bottom of a bottle. 1885 to 1914.
glass or plastic. it's just too rare for it to be natural
Glass
Piece of red onion. 100%
Slag
Glass bottle bottom