Glass-type

Is there a Glass-type Pokémon?
Glass-type Pokémon could cut grass
They could resist Flying
They could be weak to Steel

Maybe...
some Water moves would bounce right off
a Glass-type Pokémon
deflected by curvature
and some Water moves
could break some Glass-types
like Hydro Cannon
blasting a glass window

Maybe...
some Glass moves
could assist some Fire moves
where the fire's heat
is stored by the glass

Maybe, even, some Normal moves
could be super-effective vs. some Glass-types