1) Bursting into flame 2) Combustible 3) Volatile 1) Combustible 
capable of emitting sparks; of a volatile mood
• (a.) Emitting sparks of fire when struck with steel; scintillating; as, ignescent stones.
Ig·nes'cent adjective [ Latin ignescens , present participle of ignescere to become inflamed, from ignis fire: confer French ignescent .] Emitting sparks of fire when struck with steel; scintillating; as, ignescent stones. 
[adj] - can emit sparks or burst into flame
ignescent Emitting sparks of fire.
adjective can emit sparks or burst into flame
emitting sparks of fire, as certain stones when struck with steel. · bursting into flame.