W. P. Ileadden — Columbite and Tantalite. 



97 



IX. 



Sp. grav. 



6-373 



Cb 2 5 



37-29 



Ta,0 5 



44-87 



SnOo ... _.. 



0-09 



FeO 



6-87 



MnO 



11-02 



CaO 





Atom, equiv. 



Cb 2 5 _ 



100-14 



27-83 



Tao0 5 



20*21 



Sn0 2 



06 







FeO 



48-10 

 9-54 



MnO 



15-52 



Atom, ratios. 



€b: Ta... 



25-06 

 2-78 : 2 



Fe : Mn 



3: 5 



6-393 



37-91 



44-55 



0-09 



6-70 



11-05 



ir. 



100-30 



28-30 



20-07 



0-06 



930 

 15-56 



24-86 



XI. Xlla. XII6. XIII. i XIV. 



6-445 



40-28 



42-09 



0-19 



670 



11-23 



5-901 



80-98 



0-09 



618 



13-42 



57-32 



23-43 



0-09 



6-29 



13-55 



5-804 



61-72 

 18-93 



0-25 

 1121 



8-67 



6-565 



40-07 



42-92 



0-20 



9-73 



7 24 



100-49 100-67 100-68 100-79 100-16 



30-06 



19-00 



13 



48-43 49-19 



9-30 

 15-85 



25-15 



2-83:2 3:2 

 3:5| 3:5 



42-80 



12-80 



0-06 



46-07 

 8-53 

 0-17 



29-90 



1934 



0-13 



55-66 i 54-77 49-37 



8-80 

 19.00 



i 15-77 

 11-92 



13-50 

 10-20 



27-80 27-49 23'70 



7:2 

 1:2 



11: 2 

 3: 2 



3: 2 

 3: 2 



XVa. XV&. 



6-469 6-592 



Sp. grav 6-232 



Cb 2 5 41-69 40-48 



Ta 2 5 40-19 40-97J 44-48 57-60 



XVI. XVIIa. XYII&.i XVIII. XIX. I XX. 



37-28 24-40 



Sn0 2 

 FeO . 

 MnO. 

 CaO . 



o-n 



988 

 8-70 



0-15, 0-16 0-41 

 9-95. 9-29 14-46 

 9-03 8-68 2-55 

 0-73 



5-383 



2501 73-45 



56-82 2-74 



0-31 l-35 a 



14-03 11-32 



2-58 970 



0-79 0-61 



99-89 100-15 99-54 



10067 100-58 

 Atom, equiv. 



Cb 2 5 31-11 30-20 27-82 18-34 



Ta 2 5 18-10 18-46 20-00 25'95 



SnOn 0-06 0-10 0-10 0-31 



18-88 



25-60 



0-20 



55-00 

 0-30 



0-64 b 



5-780 



60-52 

 19-71 



0-09 

 12-64' 



7-51 

 tr. 



100-47 



45-16 



70-98 

 9-27 

 0-17 



12-21 

 7-30 

 0-80 



100-73 



52-97 

 8-88 1 4-17 

 0-06 0-11 



49-27 48-76 47-92 44-60 44-68. 55-94 54-10 57'25 



FeO 13-72 13-82 



MnO 12-44 1272 



Atom, ratios. 



Cb:Ta 



Fe:Mn 



26-16 26-54 



12-90 20-30 

 12-22 3-60 



19-46 15-70 

 3-65 13-40 



25-12 23-90 



7:5 

 1 : 1 



4: 5 

 5: 1 



23-11 29-10 



1: 



8: 7 



1755 

 10-57 



28-12 



5:1 

 1-75:1 



16-96 



10-30 



CaO 1 -35 



28-61 



13: 1 

 8: 5 



a Incl. W0 3 1-14. 



b Incl. W0 3 0-50. 



