Well you can do either one and you will get stone.Lava+air or Lava+water with lava and water you will get stone and steam.With lava and air you just get stone. Have fun!
Philosophy+stone
Air + Lava = Stone
Air + Lava = Stone
plankton + stone
Fire and stone
Stone+metals 
Stone and air
metal+stone
For a cockleshell: stone + plankton :)
life and stone
stone and life
air + stone