Hot stuff

A woman was looking through the tumblestones and picked up a piece of man-made silicon. It's unused stuff from silicon chip manufacture and looks great polished - silvery and strange. She held it up and asked me:

'Is this stuff artificial? It says so on the label here.'
'Yes, it's man-made.'
'Does that mean it can't be baked in an oven?'

'Um. You could, I suppose. Why?'

I wasn't really expecting that question. Turned out she made brooches by baking stuff. We talked about melting points. She didn't buy any.