SG Heritage Dictionary

Pyrognostic [Adjective] Webster's Dictionary 1913

Of or pertaining to characters developed by the use of heat; pertaining to the characters of minerals when examined before the blowpipe; as, the pyrognostic characters of galena.

Pyrognostics [Noun plural] Webster's Dictionary 1913

The characters of a mineral observed by the use of the blowpipe, as the degree of fusibility, flame coloration, etc.