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!
Stone axe = Stone + Wooden Fragments + Liana
you kill alot of gards then find a secreet passege and there will be a jint door enter you will die then have it
You make it by lava and water
fire and stone
Philosophy+stone
Air + Lava = Stone
Air + Lava = Stone
plankton + stone
Fire and stone
Stone+metals 
metal+stone
Stone and air
For a cockleshell: stone + plankton :)
dinosaur + stone
life and stone
stone and life