IGNESCENT
ignescent
(adjective) can emit sparks or burst into flame
Source: WordNet® 3.1
Etymology
Adjective
ignescent (not comparable)
Emitting sparks of fire when struck with steel; scintillating.
Noun
ignescent (plural ignescents)
A stone that emits sparks of fire when struck with steel.
Source: Wiktionary
Ig*nes"cent, a. Etym: [L. ignescens, p.pr. of ignescere to become
inflamed, fr. ignis fire: cf. F. ignescent.]
Definition: Emitting sparks of fire when struck with steel; scintillating;
as, ignescent stones.
Source: Webster’s Unabridged Dictionary 1913 Edition