Ruby silver

PROUSTITE. This ruby-silver mineral crystallizes in the hexagonal system its name is a product of its scarlet-to-vermilion color when first mined It is a silver arsenic sulfide. AgjAsS, of adamantine luster Hardness of 2-2,5 specific gravity of 5.55-5.64. Usual crystal habit is prismatic to rhombohedral more commonly occurs massive. Conchoidal to uneven fracture transparent to translucent color, scarlet to vermilion red. Light sensitive must be kept in dark environment to maintain its primary character. A product of low-tcmpcraturc formation in most silver deposits. Notable world occurrences include the Czech Republic and Slovakia, Saxony, Chile and Mexico. Found in minor quantities in the United States the most exceptional occurrence at the Poorman Mine, Silver City District. Idaho where a crystalline mass of some 500 pounds (227 kilograms) was recovered m 1865, It was named for the famous French chemist, Louis Joseph Proust. 

Arsenic is a metallic element (symbol As atomic no. 33), which exists in several allotropic forms. Various ores contain crystalline forms of arsenic salts cobaltite contains cobalt arsenic sulfide mispickel (arsenopyrite) iron arsenic sulfide orpiment arsenic trisulfide proustite (ruby silver ore) silver arsenic sulfide realgar arsenic sulfide and tennantite copper arsenic sulfide. 

Both silver (m.p. 962°C, b.p. 2212°C) and gold (m.p. 1065°C, b.p. 2807°C) have characteristic brilliant white and yellow colours in bulk but when finely divided are black or, in the case of gold, can be purple, ruby red or blue. Thus reduction of gold compounds by SnCl2 gives the colloid known as Purple of Cassius , which is used as a ceramic colorant. 

A.l Classify the following properties as chemical or physical (a) objects made of silver become tarnished (b) the red color of rubies is due to the presence of chromium ions (c) the boiling point of ethanol is 78°C. 

Some oxide-type minerals have been found to luminesce when irradiated. A simple example is ruby (aluminium oxide with chromium activator), which emits bright-red light. The phosphors are incorporated into colour television screens to emit the colours blue (silver-activated zinc sulphide), green (manganese-activated zinc orthosilicate), and red (europium-activated yttrium vanadate). 

Silvermigration, 9 824 Silver metallization, electroless, 9 697 Silver mine production, worldwide, 22 645t Silver molybdenum oxide, 22 671 Silver nitrate, 22 671-672, 22 672 addition in ruby glass manufacture, 7 344... 

The final stage is to control the temperature programme in order to promote the growth of the silver droplets to the size required to produce the yellow colour, in the same way as the production of ruby red glasses. 

Rousseau and Leroi studied the two-photon-induced chemical reaction in AgCl by 30 kW ruby-laser pulses which results in a decomposition of AgCl into collodial silver and chlorine. The resultant blue-green emission was proportional to the square of the laser intensity and the measured quantum yield was 10". ... 

Philalethes says, in A Brief Guide to the Celestial Ruby. "The Philosopher s Stone is a certain heavenly, spiritual, penetrative, and fixed substance, which brings all metals to the perfection of gold or silver (according to the quality of the Medicine), and that by natural methods, which yet in their effects transcend Nature.. . Know then that it is called a stone, not because it is like a stone, but only because, by virtue of its fixed nature, it resists the action of fire as successfully as any stone. In species it is gold, more pure than the purest it is fixed and incombustible like a stone, but its appearance is that of very fine powder, impalpable to the touch, sweet to the taste, fragrant to the smell, in potency a most penetrative spirit, apparently dry and yet unctuous, and easily capable of tinging a plate of metal. If we say that its nature is spiritual, it would be no more than the truth if we described it as corporeal, the expression would be equally correct."... 

A variety of methods are available to detect proteins separated by electrophoresis or to measure the concentration of total protein in a solution. These methods are normally based on the binding of a dye to one of the amino acids in protein, or a color reaction with an amino acid side chain. The most commonly used stains for protein detection on gels are Coomassie Brilliant Blue (98) and silver stain (99,100). These methods detect any protein residues, either in solution or on an electrophoresis gel. Their main requirement is sensitivity, not specificity. New, more sensitive dyes are being developed for the proteomic analysis of protein structure and sequence, for example Ruby Red (101). 

For as many as there are kinds of fi uits—so many kinds there are of sulphur, salt, and so many of mercury. A different sulphur is in gold, another in silver, another in iron, another in lead, tin, etc. Also a different one in sapphire, another in the emerald, another in the ruby, chrysolite, amethyst, magnets, etc. Also another in stones, flint, salts, springwaters (fontibus), etc. And not only so many... 

POLYBASITE. A mineral antimony sulfide of silver (Ag.C n)t. Sb,S. in which copper substitutes for silver to approximately 30 atomic percent. It crystallizes in the monoclinic system hardness, 2-3 specific gravity, 6.3 color, black, dark ruby red in thin splinters with metallic luster nearly opaque. From the Greek, meaning many, suggesting the many-metal basis. 

White IR, Pickford R, Wood J, Skehel JM, Gangadharan B, Cutler P. A statistical comparison of silver and SYPRO Ruby staining for proteomic analysis. Electrophoresis 2004 25(17) 3048-3054. 

Ceramic materials, including sapphire, have been used extensively in HPLC pumps for more than 20 years as pistons and check valve components. These materials have also been used to construct heads because of their good chemical stability. The use of ceramics is limited, however, because of high cost and brittleness. Although many systems have one material as the primary construction material, the wetted surfaces of a pumping system can contain several other materials. Therefore, for material-sensitive applications, all the materials in the HPLC eluent flow path should be considered. Materials that may be encountered are polymeric materials for pump seals such as fluoropolymers, polypropylene, and Teflon sapphire pump pistons and check valve seats ruby check valve balls Kalrez, KelF, or ceramic washers and spacers polymer-based transducer components and in older systems connections and joints made with silver solder. 

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