Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . ystalline scum forms, then filtered. The maximum spe-cific gravity is nearly and may be lowered by the addition ofwater to any desired point. Klein Solution.—Cadmium borotungstate with a maximum spe-cific gravity of Brauns Solution.—Methylene iodide CHJ.^ with a maximumspecific gravity of which can be lowered by the addition oftoluol. IS2 DESCRIPTIVE MINERALOGY. Penfield Solution.—Silver thallium nitrate which is liquid at 75°C, has a maximum specific gravity of over which can be lo
Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . ystalline scum forms, then filtered. The maximum spe-cific gravity is nearly and may be lowered by the addition ofwater to any desired point. Klein Solution.—Cadmium borotungstate with a maximum spe-cific gravity of Brauns Solution.—Methylene iodide CHJ.^ with a maximumspecific gravity of which can be lowered by the addition oftoluol. IS2 DESCRIPTIVE MINERALOGY. Penfield Solution.—Silver thallium nitrate which is liquid at 75°C, has a maximum specific gravity of over which can be low-ered by the addition of hot water. In all of these the method of determining the specific gravity ofa mineral, necessarily lighter than the liquid, is to add the diluentdrop by drop until the mineral fragment will just float or if pushedin will stay wherever pushed. For determining the specific gravity of the liquid the most con-venient balance is that of Westphal, Fig. 343. The beam is gradu-ated in tenths and the weights A, B and C are respectively unit, 1(7 ^d J-J-0-. Fig. The balance is so constructed that when the thermometer floatis suspended in distilled water at 15° C. a unit weight must behung at the hook to obtain equilibrium. If then the test tube is nearly filled with the heavy liquid andweights added until equilibrium is secured the specific gravity isknown. For instance in the figure the weights employed are : Unit weight at hook, value Unit weight at sixth division, value tV weight at sixth division, value. TTU weight at ninth division, value Specific gravity CHARACTERS OF MINERALS. 153 For rough determinations a series of stoppered tubes containingsolutions of known density is very convenient. TASTE. Some minerals have a decided taste which is usually either : Astringent, the taste of alum. Saline or Salty, the taste of common salt. Bitter, the taste of epsom salts. Alkaline, the taste of soda. Acid, the taste of sul
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