please add raw glass recycling - I lost my dwarf because I embarked on a map without a sand and it has a strange mood, while being a glassmaker. I had raw glass that I specially bought from traders, but found out that it can not be recycled

This does seem useful for locations without sand, you can buy glass goods and melt them down to make your own or mass produce and recycle things to train glassmakers, as you can do with metal.