Horn quicksilver

Hom-klee, m. bird s-foot trefoil (Lotus corni-culatus). -kobalt, n. asbolite. -Ibffel, m. horn spoon, -mohn, m. horn poppy (Glau-cium). -quecksilber, n. horn quicksilver (native mercurous chloride), -schicht, /. horny layer, specif, epidermis, -silber, n. horn silver (cerargyrite). -spatel, m. horn spatula, -stein, m. homstone (variety of quartz). 

Horn quicksilver—subchloride of mercury, or native ealome]—is found associutsd with the other ores of quicksilver at Idria, at Deux-Ponts, in Spain, and elsewhere. It is a yellowish or ash-grey mineral, sectile, and suhtranslucent. Sometimes it occurs as a crust, or forms granular concretions,. At other times it crystallizes in four-sided prisms. Its specific gravity is 6-4S2, whilst that of the powdered calomel of the shops is 7T4, and that of the crystallized factitious subchloride is 7-2. 

Mercuric chloride 4139 HgCl2 Bichloride of mercury corrosive chloride of mercury corrosive sublimate horn quicksilver oerchloride of mercury. 

Syn. Calomel—Occurs sparingly as horn quicksilver in the mineral kingdom. May be prepared either by subliming a mixture of bichloride of mercury and mercury, HgCl, -j- Hg, which yields 2 HgCl or by adding hydrochloric acid or solution of common salt to a solution of protonitrate of mercury, when the protochloride is precipitated. HgO, NOj - - NaCl = NaO, NO, - - HgCl. It is a heavy white volatile powder, insoluble in water. It is blackened by alkalies. When first prepared, it is always contaminated with corrosive sublimate, and must be well washed with hot water before it is used as a medicine. 

Calomel [10112-91-1] (syn., horn quicksilver) [from the Greek, kalos, beautiful, and melas, black] (ICSD 64683 and PDF 26-312) HgA M = 472.0854 84.98 wt.% Hg 15.02 wt.% Cl Coordinence Hg(5) (Halides) Tetragonal a = 447.8 pm c= 1091.0 pm (Z = 4) S.G. l4/mmm P.G. 4/mmm Uniaxial (e>) a>s 1.973 fs 2.656 Color white, yeUowish gray, gray, yellowish white, or brown. Luster adamantine, resinous. Luminescence fluorescent. Diaphanaty translucent to subtranslucent. Streak pale yellowish white. Qeavage (100), (011). Twinning (110). Fracture conchoidal, sectile. Occurrence oxidized mercury deposits. Easy fusible (m.p. 525 C). Insoluble in water. 

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