pyrophoric

Spontaneously igniting in air.

Producing sparks by friction.

Same as pyrophorous.

Light-producing; of or pertaining to pyrophorus.

finely reduced iron, which ignites spontaneously on contact with air.

spontaneously igniting in air, especially when in a finely divided state

producing sparks, especially by friction

Able to oxidize with exposure to atmospheric oxygen at normal temperatures.