A glossary of mineralogy . , No, , Brooke §• Miller. Copper-TJranite, See , Thomson. See after Dr. John See Lydian , Werner. Hexagonal. Oc-curs in crystals, which are usually termi-nated differently at the opposite extremities,and the prisms often assume triangularforms, owing to the absence of alternatefaces. Sometimes occurs massive, compact;also columnar, coarse or fine, parallel ordivergent; also in detached crystals. Co-lour black, brown, blue, green, red, andrarely white or colourless. Exhibits di-chroism.
A glossary of mineralogy . , No, , Brooke §• Miller. Copper-TJranite, See , Thomson. See after Dr. John See Lydian , Werner. Hexagonal. Oc-curs in crystals, which are usually termi-nated differently at the opposite extremities,and the prisms often assume triangularforms, owing to the absence of alternatefaces. Sometimes occurs massive, compact;also columnar, coarse or fine, parallel ordivergent; also in detached crystals. Co-lour black, brown, blue, green, red, andrarely white or colourless. Exhibits di-chroism. Some specimens are red inter-nally arid green externally; others are redat one end, and green, blue, or black at theother. Of every variety of transparency,from perfect cleaimess to opacity. Differsin transparency across the prism, and in theline of its axis. Streak uncoloured. subconchoidal, uneven. H. rathergreater than Quartz, 7 to 7-5. 2-94to , BB swells up and fuses to a Fig, 439, Fig. 440. Fig, 441. Comp. (R3 a B) Si. Rammelsberg has divided Tourmaline in-to five sub-groups, viz. I. Magnesia Tour-maline. II. Iron-magnesia Tourmaline. Tourmaline, black. lY. Iron-man-ganese-lithia Tourmaline. V. Lithia Tour-maline. Magnesia Tourmaline. Comp. li^ tSi + 3-R Si + B Si, or (K^ ?§. B) Si. 3 to3-07; mean 3-05. Analyses, bv Rammehherg. (a) Brown,from W. Kappe], Carinthia. 3-049.(h) Black, from Zillerthal. 3-054. («) WLoss by ignitionSilicaAlumina .Boracic acidPeroxide of ironProtoxide of ironMagnesiaLimeSoda Potash .Phosphoric acidFluorine . 3-19 3-54 38-85 37-94 31-32 33-64 8-25 8-58 1-27 2-79 0-37 14-89 10-46 1-60 0-98 1-28 2-13 0 26 0-37 0-24 2 28 2-50 103-19 103-54 II. Iron-magnesia Tavrmaline. 3-05to 3-2 ; mean 3-11. Black, from 3-072. Silica . Alumina Boracic acid. Peroxide of iron Protoxide of iron Magnesia LimeSoda . acid III. Iron Tourmaline. SBlac
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectmineral, bookyear1861
