What's the difference between pyrognostic and pyrognostics?
Pyrognostic
Definition:
(a.) 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.
Example Sentences:
Pyrognostics
Definition:
(n. pl.) The characters of a mineral observed by the use of the blowpipe, as the degree of fusibility, flame coloration, etc.