From Dwarf Fortress Wiki
Saltpeter is a non-economic yellow stone found within sedimentary layers. It is one of the few stones which will boil in magma.
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It is rumored that if a Dwarf ever discovers this, Dwarven "Civilization" would come to an explosive, but Fun end.
[INORGANIC:SALTPETER] [USE_MATERIAL_TEMPLATE:STONE_TEMPLATE] [STATE_NAME_ADJ:ALL_SOLID:saltpeter][DISPLAY_COLOR:6:7:1][TILE:'x'] [ENVIRONMENT:SEDIMENTARY:CLUSTER_SMALL:100] [SOLID_DENSITY:1201] [IS_STONE] [MELTING_POINT:10601] [BOILING_POINT:10720]