60 BORATE. 



Localities. In beds of Anhydrite, Gypsum, 

 or Salt, in small but very perfect isolated 

 crystals at Kalkberg and Scliildstein, near 

 Liineberg, in Hanover ; Segeberg, near Kiel, 

 in Holstein; Luneville, La Meurthe, in 

 France ; massive or as part of the rock at 

 the salt-mine of Stassfurth, in Prussia. 



Brit. Mus., Case 39. 



Borate of Li^vie, Hayes. See Hayes- 



BoRATE OF Lime, Phillips. See Datho- 



See 



LITE. 



Borate of Magnesia, Phillips 



BORACITE. 



Borate of Soda, Phillips; Borax, 

 Dana. Oblique. Occurs in prismatic 

 crystals variously terminated, and yield- 

 ing to mechanical division parallel to the 

 lateral planes of the primary form — an 

 oblique rhombic prism of 86^ 30' and 93^ 30' 



and both its diagonals. Colour Avhitish, 



sometimes with tinges of blue, green, or 

 grey. Lustre vitreous, sometimes earthy. 

 Translucent or nearly transparent to opaque. 

 Streak white. Soft and brittle. Fracture 

 conchoidal. Taste sweetish-alkaline. H. 2 

 to 2-5. S.G. 1-74. 



Fig. 58. 



Comp. Na B2 + 10 H thoracic acid 36-58, 

 soda 16-25, water 47-17 = 100. 



BB swells and then fuses to a transparent 

 globule. 



Soluble in eighteen parts ©f water at temp. 

 60° F., and in six pai'ts of boiling water; 

 and the solution changes vegetable blues 

 to greens. 



Localities. Thibet, where it is dug in 

 large lumps on the borders of lakes, when 

 the heats of summer have rendered the 

 waters shallow ; or the water of the lakes 

 is admitted into reservoirs, at the bottom of 

 which the salt is found after the water has 

 evaporated. From Thibet it is carried to the 

 East Indies, whence, after being purified, it 

 is exported under the name of Tincal. In 

 Persia, the water of certain wells being con- 

 ducted into reservoirs and evaporated, de- 

 posits the Borax, or Borech, as they call it. 

 It is now made in large quantities from the 

 boracic acid of the Tuscan lagoons. It is 

 also found in the province of Potosi, in 



BOTRYOGENE. 



Peru ; in Cevion, and in the mineral springs 

 of Chambly," St. Ours, Canada W. 



This salt is used as a flux in several 

 metallurgical processes, and is highly valu- 

 able in aiding the process of soldering. It 

 is also used in the manufacture of glass and 

 artificial gems. See Tincal. 



Brit. Mus., Case 39. 



BoRAziT. See Boracite. 



BoRNiNE, Beudant. See Tetradymite. 

 Named after De Born. 



BoRNiTE, Brooke 8f Miller, Nicol. See 

 Erubesoite. This name has also been 

 given by one or two authors to a variety of 

 Telluric Bismuth (see Tetradymite), 

 which occurs in thick foliated masses, with 

 a crystalline structure, and from half an 

 inch to an inch in diameter, splitting 

 into thin plates like Talc and Mica. 

 Colour and lustre like those of highly 

 polished steel. Flexible. Sectile. Soils the 

 fingers like Plumbago or Molybdenite. 

 Streak metallic, and nearly the colour of 

 the pulverised mineral. H. 2-25. S.G. 

 7-866. 



Comp. 2 Bi Te + Bi S^. 



Analysis by C T. Jackson : 



Bismuth .... 79-08 

 Tellurium .... 18-00 

 Selenium . . . . I-IS'^' 

 Gold ..... 006 

 Loss ..... 1-14 



100-00 



BB on charcoal, fuses giving off white 

 fumes, Avhich have the odour of Selenium ; 

 leaves a white deposit on the charcoal, and 

 a yellow ring near the globule, and a little 

 metallic Bismuth is obtained. This, cu- 

 pelled, gives a little gold. 



Localities. Field's gold mine, in Dahlonga, 

 Georgia ; in a vein of Quartz, in hornblende- 

 slate rocks, associated with Native Gold and 

 some Auriferous Iron Pyrites. Jose, in Bra- 

 zil, in marble. 



Name. After De Born. 



Brit. Mus., Case 7. 



BoRNSTEiN or Bernstein. See Amber. 



BOROCALCITE. 

 BOKONATROCALCITE. ^ 



BoROSiLiCATE OF LiME, Thomson. See 

 Datholite. 



BoitsAURERKALK. See Hayesine. 



Botryogene, Nicol, Haidinger, Phillips. 

 Oblique : Primarv form an oblique rhom- 

 bic prism of 119° m' and 60° 4'. Oc- 

 curs in small crystals, which are often ag- 

 gregated in reniform and botryoidal shapes, 

 consisting of globules with a crystalline 

 surface, sometimes like a bunch of grapes ; 



See Hayesine. 



