Just trying to flesh out some things for my elementally inclined mages in a homebrew game. I am trying to think of a particular substance that can be created by combining 3 of the four elements (fire, water, earth, & air) what I have so far:

Earth, Wind, & Water = ???

Earth, Wind, & Fire = Glass

Earth, Water, & Fire = Pottery

Wind, Water, & Fire = ???

If it helps here are the combinations of every 2 elements:

Water Fire = Steam

Water Air = Ice

Water Earth = Mud/Quicksand

Earth Fire = Lava

Earth Air = Sand

Fire Air = Shock

There are also expert levels of each element:

Earth=Metal

Fire=Black Flame (can't be put out until there is no longer fuel)

Water=All water based liquids

Air=Vaccuums

Grateful for any help I could get.