NATIVE MERCURY OR QUICKSILVER. It does not wet the finger. It feels very cold. It is uncommonly heavy. Specific gravity, in its fluid state, 13.581, Hauy. When solid, 15.61, Biddle. Chemical Characters. It volatilises entirely before the blowpipe, at less than a red heat. Constituent Parts. According to Klaproth, it contains no intermixture of any other metal. Geognostic Situation. This mineral occurs principally in rocks of the coal formation, and either disseminated, or in veins traversing them. It is associated with ores of mercury, and often also with iron-pyrites, heavy-spar, calcareous-spar, and quartz. Small veins of it are rarely met with in primi tive rocks, where it is accompanied with native silver, grey manganese-ore, and flexible asbestus. Geographic Situation. Europe.—It is found at Idria in the Friaul; Niders- lana in Upper Hungary ; Morsfeldt and Wolfstein in the Palatinate; Moschellandsberg and Stahlberg in Deux- Ponts; Leogang in Salzburg ; Horzowitz in Bohemia,; Almaden in Andalusia, and Albaracia in Arragon ; m slate-clay at Paierno in Sicily ; and at Oristani m Sar dinia. America.—Guancavelica in Peru. B 3 Usts '