270 



J^ew Specific Gravities of Minerals. 



46. 



47. 



48. 



6.361, 

 6.369, 

 6.534, 



49. 6.565, 



50. 5.029, 



51. 

 52. 

 53. 



4.284, 

 7.362, 

 7.123, 



54. 3.481; 

 55. 2.619, 



The same, from Schneeberg. 



The same, from Freiberg. 



The same, fine white, resembling the nickel pyrites, 

 frorn Schneeberg. 



The same, of regular crystalline dentritic conglome- 

 rates, from Schneeberg. 



Octahedral crystalline and reticulated iron pyrites, 

 Schneeberg. 



Berthierite, from the Auvergne. 



Diatome Wolframite, from Brazil. 



White nickel pyrites, (biarsenide of nickel,) Schnee- 

 berg. 

 Fragments of a large crystal of titanite — variety from 

 Arendal. 



Yellowish white tetartine felsite, (tetartin,) accompa- 

 nying the topaz crystals of the Uralian Mountains. 



Native bismuth, from Brazil. 



A mineral from near Bonn, said to be Allophane. 



Supposed to be an artificial product. 



Brass from a manufactory — Voigtland. 



The same. " 



Ouwarowite, from Bisersk, Uralian Mountains. 



Manganiferous ore. Saxony. 



The true Sarkolite, from Vesuvius. 



A green pyroxene, accompanying the sarkolite. 



Hydrolite or Gmelinite, from Scotland. 



Fiedler's Chloritoid, from the Uralian Mountains, ac- 

 companying the diaspore and has the structure of 

 mica. 



Manganesian epidote, from Piedmont. 



Topaz, from Uralian Mountains. 



Chrysocolla, from Mexico. 



Tautokline calcareous spar, R = 106° 10', Saxony. 



Dark greenish white arragonite, from Silesia. 



Zeolite, fibrous radiated, from Bohemia, belonging 

 perhaps to comptonite. 



