Elements of Mineralogy, Crystallography and Blowpipe Analysis: From a Practical Standpoint, Including a Description of All Common Or Useful Minerals, Their Formation and Occurrence, the Tests Necessary for Their Identification, the Recognition and Measurement of Their Crystals, and Their Economic Importance and Uses in the ArtsVan Nostrand, 1916 - 631 strani |
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amphibole arsenopyrite axes axis bead Beyschlag bismuth BLOWPIPE blue borax brittle brown calcite carbonate cent chalcopyrite chiefly cleavage closed tube coal coat cobalt cobalt solution cold colorless composition copper crystalline crystals deposits DESCRIPTION.-A epidote ETC.-Fuses ETC.-Infusible ETC.-On charcoal faces feldspars fibrous fluorite FORMATION AND OCCURRENCE fumes fuses fusible glass gold granite granular gray green greenish gypsum H₂O heat Hexagonal hydrochloric acid iron Isometric Krusch limestone limonite LUSTRE magma magnetic magnetite manganese masses metallic mica minerals described Monoclinic nearly nickel nitric acid occurs odor opaque optic Orthorhombic oxide parallel pegmatites Physical Characters pinacoid plane platinum precipitate prism production pyramid pyrite pyroxene pyrrhotite quartz rarely refraction REMARKS.-Occurs residue rhombohedron salt schists siderite silicates silver soda sodium Soluble sometimes species sphalerite STREAK sublimate substance sulphate sulphides Supplement angles symmetry TENACITY tons tourmaline translucent transparent usually veins violet vitreous volatile yellow zinc
Priljubljeni odlomki
Stran 199 - Co obscures the tests, dissolve the substance in borax on charcoal to saturation, and treat for five minutes in hot RF If a visible button results, separate it from the borax, and treat with S. Ph. in the OF, replacing the S. Ph. when a color is obtained. If no visible button results, add either a small gold button or a few grains of test lead.
Stran 185 - The residual button will be bluish-green when melted, will dissolve in the slag and color it red upon application of the OF, or may be removed from the slag and be submitted to either the S. Ph. or the flame test. FLUORINE, F. Etching Test. — If fluorine is released it will corrode glass in cloudy patches, and in presence of silica there will be a deposit on the glass. According to the refractoriness of the compound the fluorine may be released : (a) In closed tube by heat.
Stran 194 - RF Yellow coat, white when cold, assisted by soda and a little borax. With Cobalt Solution. — Moisten the coal, in front of the assay, with the solution, and blow a strong RF upon the assay. The coat will be bright yellow-green when cold. INTERFERING ELEMENTS. Antimony. — Remove by strong OF, or by heating with sulphur in closed tube. Cadmium, Lead or Bismuth. — The combined coats will not prevent the cobalt solution test.
Stran 198 - S. and with yellow fringe ; but if quickly heated, the coat formed is pale yellow and black. Confirmation Hg. — If the substance is heated gently in a closed tube or matrass with dry soda or litharge, a mirror-like sublimate will form, which may be collected into little globules of Hg by rubbing with a match end. The test with bismuth flux on charcoal yields only a faint yellow coat. Bi. — Bright chocolate-brown coat, with sometimes a reddish fringe.
Stran 186 - Violet, choking vapor and brown sublimate. In Open Tube, with equal parts Bismuth Oxide, Sulphur, and Soda. — A brick-red sublimate. With Starch Paper. — The vapor turns the paper dark purple Interfering Elements. Silver. — The iodide melts in KHSO4 to a dark-red globule, yellow on cooling, and unchanged by sunlight.
Stran 197 - ... moisten with water and let stand. S, Se, Te. — The bright silver is stained black or dark-brown, and unless the horseradish odor of Se or the brown coatings of Se and Te with bismuth flux have been already obtained, this stain will prove sulphur. CONFIRMATIONS S. — The soda fusion will evolve H2S when moistened with HC1. By holding in the gas a piece of filter paper moistened with a drop or two of lead acetate (test is made more sensitive by adding a drop of ammonia to the acetate), the paper...
Stran 180 - NH.. In Closed Tube. — Evolution of gas with the characteristic odor. Soda or lime assists the 'reaction. The gas turns red litmus paper blue and forms white clouds with HC1 vapor. ANTIMONY, Sb. On Coal, RF\ — Volatile white coat, bluish in thin layers, continues to form after cessation of blast and appears to come directly off the mass.
Stran 198 - Test IV. may yield colored sublimates with large amounts of certain other elements, and on smoked plaster certain white sublimates are obtainable. In all cases the elements are detected with greater certainty by other tests, but for convenience they are here summarized : Sn...
Stran 181 - On Coal. — Faint yellow or red coat. In Open Tube. — Dense, white, non-volatile, amorphous sublimate. The sulphide, too rapidly heated, will yield spots of red. In Closed Tube. — The oxide will yield a white fusible sublimate of needle crystals ; the sulphide, a black sublimate, red when cold. Flame. — Pale yellow-green. With S.
Stran 185 - ... patches, and in presence of silica there will be a deposit on the glass. According to the refractoriness of the compound the fluorine may be released — (a) In closed tube by heat; (6) In closed tube by heat and KHSO«; (c) In open tube by heat and glass of S. Ph. With Cone. H=SO