PHYSIOGRAPHY. CLASS I. 



pipe in its water of crystallisation, and is converted into a 

 spongiform mass. 



3. The octahedral Alum-salt commonly appears in a state 

 of efflorescence upon several minerals, which contain alu- 

 mina, as upon rhombohedral Alum-haloide, alum-slate, alum- 

 earth, &c. : but it occurs also in a solid shape accompany- 

 ing brown-coal, and is contained in the waters of certain 

 mineral wells. 



4. It is found in several parts of Italy. At Tschermig near 

 Kommothau in Bohemia, it forms thin layers between the 

 strata of brown-coal. It is likewise met with at Freien- 

 walde in Silesia, in England and Scotland, in Norway, 

 Sweden, &c. 



5. The salt as produced by nature requires first to be 

 purified, in order to be applicable in the arts. A great 

 quantity is obtained by the assistance of chemical processes. 

 Its uses are various, in dyeing, in manufacturing leather 

 and paper, for preventing putrefaction, &c. 



GENUS IX. BORAX-SALT. 

 1. PRISMATIC BORAX-SALT. 



Prismatic Borax. JAM. Syst. Vol. III. p. 45. Man. p. 18. 

 Borate of Soda. PHILL. p. 192. Tinkal. HAUSM. 

 III. S. 841. Boraxsaures Natron. LEONH. S. 623. 

 Soude borate'e. HAUY. Traite, T. II. p. 366. Tabl. 

 comp. p. 20. Traite', 2de Ed. T. II. p. 200. 



Fundamental form. Scalene four-sided pyramid. 

 P = 152 9', 120 23', 67 3'. Inclination 

 = 0', in the plane of the long diagonal. 

 Vol. I. Fig. 41. HAUY. 



a : b : c : d = 1 : 12 : *W125 : 0. 



Simple forms. ? (o) = 120 





