Intellmence and Miscellaneous Articles, 237 



•^ts 



Jamesonite from Estremadura. Analysed by Count F. ScliafF- 

 gotscli. (From PoggendorfF's AnnaleUi Band xxxviii. Stuck 2.) 



The specimens analysed were readily cleavable in a direction 

 perpendicular to the axes of the crystals, and with some difficulty 

 in several directions parallel to the axes of the crystals. Lustre, 

 metallic. Colour, dark lead-gray. Streak, blackish gray. Hard- 

 ness, a little greater than that of rock salt. Specific gravity 

 = 5'616 at 19° cent. 



Lead 39-971 



Antimony 32*616 



Sulphur 21-785 



Iron 3-627 



Bismuth 1-055 



Zinc 0-421 



99-475 



The following analyses of Augite, Amphjbole, &c., by M. Jos. 

 Kudernatsch, are from PoggendorfF, Band xxxvii. Stiick 4. 



Augite from Zigolon-Berg in Fassathal. Specific gravity = 3358 

 at 17° R. 



1. 2. Oxygen in 2. 



Silica 50-09 50-15 26-05 



Alumina 4-39 4-02 1-87 



Lime 20-53 19-57 5-49 



Magnesia .. 13-93 13 48 5-21 



Oxide of iron 1M6 12-04 2-74 



100-10 99-26 



Augite from Gillenfelder Maar in the Eifel. Specific gravity 

 = 3-356 at 17° R. 



1. 2. 3. 4. Of Oxygen in 4. 



Silica 49-79 47*05 4876 49-39 2565 



Alumina'... 6-67 5*16 4 99 6-00 2 83 



Lime 22*54 23-77 23-26 22-46 6*30 



Magnesia .. 12*12 15*35 J5-78 13-93 5*39 



Oxide of iron 8-02 7*57 7-21 7*39 1-68 



99-14 98-90 100-00 9925 

 Augite from the Rhcengebirge. Specific gravity = 3*347 at 17° R. 



1. 2. Oxygen in 2. 



Silica 501 1 50-73 26-35 



Alumina 6-68 647 3*02 



Lime 18*66 18 90 5-30 



Magnesia .. 15 72 16 91 6-54 



Oxide of iron 7*55 7 26 1*64 



Augite from jEtna. Specific gravity = 3-359 at 17° R. 



Oxygen. 



Silica 50-55 26-26 



Alumina 4 85 2-26 



Lime 22*29 6*26 



Magnesia 1301 5*03 



Oxide of iron 796 1*81 



98-66 



