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No light or sound?
Ok
Plasma (that is, superheated gas. Though similar to both the electric and fire types, would be separate)
SE on Ground, Rock, Steel (Can burn through these), Water (evaporates it)
NVE on Poison, Grass, Dragon and Fairy
Resists Ground, Rock, Fire and Electric
Weak to Ice (needs a buff / super-cooling), Dragon and Fairy
Crystal (Variation of Rock/Ground, immune to sandstorm)
SE on Ground (Crystals come from ground), Ghost (soul-shielding crystals), Electric (conducts electricity but is not affected by it), Psychic and Fairy (mind-shielding and folklore)
NVE on Fighting, Rock, Bug, Steel, and Fire
Resists Ghost, Electric, Psychic and Fairy
Weak to Fighting, Rock, Steel and Fire
Radiation (or some variation of it)
SE on Ghost, Fire, Water, Grass, Electric and Fairy (Radiation messes with these supernatural and inherently elemental powers)
NVE on Normal, Fighting (Non-elementals), Poison, Ground and Bug (resists fallout)
DNE steel (lead is used to counter radioactive particles)
Resists Ghost, Fire, Water, Grass, Electric
Weak to Ground, Bug and Psychic (same reason for poisons weakness to psychic)
Immune to Fairy (to nerf it)
I'd like to see an elemental darkness - rather than the jerk version we currently have - in the form of a shadow type or something, but I can't think of how it would fit in the typechart.