Mercury native

It is a white crystalline, brittle metal with a pinkish tinge. It occurs native. Bismuth is the most diamagnetic of all metals, and the thermal conductivity is lower than any metal, except mercury. It has a high electrical resistance, and has the highest Hall effect of any metal (i.e., greatest increase in electrical resistance when placed in a magnetic field). 

Mercury (Quicksilver, Hydrargyrum), Hg, at wt 200.61, silvery liq, mp —38.87°, bp 356.9°, d 13.546g/cc at 20°. Insol in w, HC1, ale and eth sol In nitric acid. Sometimes found native poisonous. Can be prepd by heating the ore cinnabar (HgS) either in air or with lime. Forms numerous salts, some of which are very expl, eg, Hg fulminate, Hg azide, etc. The presence of Hg in expls, even in minute quants, is unde-sireable because it affects the result of thermal stability tests. Marshall (Ref 1) describes various tests used in Engl and Ger for its detection in different expls and propints Refs 1) Marshall 2, 708-12(1917) 2) Mellor... 

Mystagogus, Cleidophorus. Mercury s caducean rod or, the great and wonderful office of the universal mercury, or God s vicegerent (sic ), displayed. Wherein is shewn his nativity, life, death, renovation and exaltation to an immutable state to which is added a general epistle discovering the mysterious fire of Pontanus. By. The second edition. 2nd ed ed. 1702 reprint, London Printed by William Pearson, for Thomas Ballard, at the Rising Sun in Little Britain, 1704. 76, 32p. 

Native silver is rarely found in the form of nuggets, and it is probably for this reason that silver was recognized and came into widespread use at later times than did gold. Much native silver occurs as minute grains dispersed in small concentration in argentiferous (silver-rich) sands. Now, when silver is mixed with mercury, it forms amalgams (see below) the amalgamation... 

Mercury (chemical symbol Hg, from the Latin name of the metal, hydrar-gyrium, liquid silver), previously also known as quicksilver is, at ordinary temperatures, a silvery white liquid metal that boils at 360°C. The metal is occasionally found in nature in the native state. Most mercury has been derived, however, from the red mineral cinnabar (composed of mercuric sulfide) that was also used in the past as a red pigment known as vermilion (see Textbox 41). The Greek philosopher Aristotle, writing in the fourth... 

Hogan LS, Marschall E, Folt C, Stein RA (2007) How non-native species in Lake Erie influence trophic transfer of mercury and lead to top predators. J Great Lakes Res 33 46-61... 

Broo, B. and T. Odsjo. 1981. Mercury levels in feathers of eagle-owls Bubo bubo in a captive, a reintroduced and a native wild population in SW Sweden. Holarctic Ecol. 4 270-277. 

Yamada, M., Tohno, S., Tohno, Y., et al. (1995). Accumulation of mercury in excavated bones of two natives in Japan. Science of the Total Environment 162 253-256. 

Chemical perturbations can be a useful approach to this problem. In laccase, selective replacement of the type 1 coppo- with mercury has allowed the type 1 site in laccase to be characterized stmcturally, even in the presence of three other copper atoms (27). Likewise, Simolo et al. have studied independently the a and 3 subunits in hemoglobin by preparation of the (a-M)2(P-M )2 derivaties, where M and M are different metals (28). An alternative to replacement is metal removal, for example Cu in cytochrome-c oxidase (29) or the T3 Ci in laccase (30). The concern with all of these approaches is to establish that the modified protein has the same metal-site structures as the native protein. 

Mercury(II) oxide is found natively in the mineral montroydite. The oxide is used primarily to prepare other mercury salts. The red form of the oxide is used as a depolarizer in a certain type of dry batteries. Other applications are paints and pigments as a reagent in several wet analyses and to catalyze in organic reactions. The oxide also is used in ointments as a topical antiseptic. 

Red sulfide occurs natively and is mined from mineral cinnabar. Also it can be prepared by beating mercury with a solution of potassium pentasulfide, producing a scarlet cinnabar ... 

Few metals occur in the earth s crust uncombined with others. Those that do, such as gold, silver, mercury, and some copper, are known as the native metals. Together with some native nonmetals such as carbon and sulfur, the native metals make up the relatively small group of native elements, naf-urally occurring masses of single elements that were recognized and put to use by humans in quite early times. Most metals occur in nature combined with nonmetals in the form of mineral and rock deposits, and from fhose minerals they are extracted by means of a variety of metallurgical fechniques. 

Father de Acosta told how Henrique Garces, a native of Portugal, discovered that the red substance llimpi with which the Indians used to paint their faces was the same as the Castilian vermilion. After the mines of Palcas in the territory of Guamanga had been discovered in this way, much of the mercury obtained from them was shipped to Mexico to be used in the refining of silver (232). Pedro Fernandez de Velasco, who... 

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. 

The principal ore of toerenry is the sulphide—tho Annober of the Gormans and minium of Pliny. The color of native cinnabar varies from coehineal red to brownjsh-Ted and leaden grey. The.streak is scarlet, and the lustre usually adamantine. The density of this mineral is 8-098, and when pure it contains 86-29 parts of mercury with 13-71 of sulphur. Specimens of the purest ore have, occasionally,. all the richness of hue which the best vermilion presents. 

Protosulphide of Mercury.—Cinnabar, Vermlion.— This is a much more important compound, though, like the former, medicinally inert. The character and composition of the native ore have been already explained. Only a small quantity of that mineral, however,is of suffi-cicntly fine quality to permit of its being employed as a pigment. Chemically, there ia nq difficulty in forming it ... 

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