The Collaborative International Dictionary
Pyrognostics
Pyrognostics \Pyr`og*nos"tics\, n. pl. (Min.) The characters of a mineral observed by the use of the blowpipe, as the degree of fusibility, flame coloration, etc.
Wiktionary
pyrognostics
n. (context dated English) The characteristics of a substance, especially of a mineral or metal salt, that are revealed by heat, especially by the use of a blowpipe and a charcoal block.