firing agate rocks with pottery

if the rocks have any embedded moisture in them, they'd explode in the kiln.

you might try firing them separately first.

very risky!

i think they'll melt down nicely. i think they are mostly a quartz make up.

they also likely have no water trapped inside. rocks usually form over time & temperature - like fired pots.

make sure your initial bowl is well made. i have fired pots with glass inside to melt up in a similar maner, and some pots crack up from the glass shrinking at a much different rate then the pot.

one aspect of this that is fun is that the glass melts at such a different temp, that upon cooling down you get crackles in the glass, yet the surface also skins over to keep a clean flat layer on top. when seen in the sunlight they can look like a layer of gem stones.

i've found green beer bottles work very well!

steve

steve graber