New Specific Gravities of Minerals. 



269 



3.830, Colophonite, which is the true dodecahedral garnet 

 and ought to be brought to the Aplome, from 

 Arendal. 

 N. B. These three substances, generally called colophonite, and 

 not exhibiting any varieties to the eye, have on account of their 

 form of cleavage and crystals been clearly distinguished by Brei- 

 thaupt as as pyroxene, tetragonal and dodecahedral garnet ; the col- 

 ophonite is most frequently, tetragonal. 



24. 3.976, Earthy sulphate of barytes, Saxony. 



25. 2.510, Metaxite, from Silesia. 



26. 2.518, Picrolite, from Silesia. 



27. 2.334, Lasionite, (Wavellite,) from Freiberg. 



28. 2.981, Nephrite, greenish grey to mountain green variety, 



from a lump of 76 lbs. 



29. 2.952, Granular tremolineamphibole,(tremo]ite,) from Swe- 



den, accompanying arsenical pyrites in talcose 

 slate. 



30. 2.574, Alum slate from Strehla, Saxony, the only slate 

 where chiastolite has been found. 



Sulphate of barytes, from Saxony. 



Calcareous spar, (the heaviest calcareous spar of 

 R=105° 8'.) 



Polymorphous calcareous spar, (the lighter.) 



A characteristic hepatic pyrites, Freiberg. 



Black schorl, yet belonging to the dicromatic, from 

 Tyrol. 



Four fine pure grains of iridosmin, Uralian moun- 

 tains. 



Common greenish gray quartz. 



Galapectite, from Silesia, (new mineral and new lo- 

 cality.) 



39. 2.702, A mineral similar to magnesite, accompanying the 



kerolite, from Silesia. 



40. 4.202, Almandin garnet, from Freiberg. 



41. 3.255, A problematic pyroxene in basalt, from Silesia. 



42. 3.320, Black amphibole, from Bohemia. 



43. 5.577, Pyrites, Hessia. 



44. 6.195, Cobaltic marcasite, (arsenical cobalt,) from Schnee- 



berg. 



45. 6.304. The same, in fragmentary crystals, from Hessia. 



