Table 4. 

 The System Anorthite-Forsterite-Silica. 



Composition in weight per cent 



Components in 

 ternary system 



Oxides 



An 



Fo 



90 



8*74 



80 



8-74 



80 



17-48 



70 



10 



70 jl7'48 



70 



23-08 



70 



26*21 



60 



8*74 







60 



20-00 



60 



29-71 







60 



60 



31-45 



34-95 



Si0 2 



Si0 2 



A1 2 3 



CaO 



1-26 



43-92 



32-99 



18-09 



11-26 



49-60 



29-32 



16-08 



2-52 



44-60 



29-32 



16-08 



MgO 



5-00 



5-00 



20 



12-52 



6-92 



3-79 



31-26 

 20-00 

 10-29 4 



54-55 25-66 



50-27 



47*06 



25-66 



25-66 



45-27 25-66 



14-07 



14-07 



14-07 



14-07 



60-95 21-99 12-06 



j 



5451 21-99 12-06 



8-55 47-95 



21-99 



12-06 



21-99 12-06 



5-05 



56 22-72 21-28 



55 



54-50 



26-21 18-79 



25-3320-17 



45-95 



55-22 



53-79 



54-59 



21-99 



12-06 



10-00 



5-72 



10-00 



13-21 



15-00 



5-00 



11-44 

 17*00 



18-00 



20-00 



20-52 11-26 13-00 



20-16 11-05 15-00 



19-97 



10-95 



54 30 16 52-17 19-79 10-86 



14-49 



17-17 



53 



52-50 



26-2120-79 



20-10 27-40 



54-92 



58-71 



52-00 13-98 34-02 ,62-49 



50-43 



14-92 34-65 



62-84 



19-43 10-65 15-00 



19-24 



10-55 



11-50 



19 06 10-45 8-00 



18-48 10-14 8-54 



£ * 



§.& 



3^ 



1470 

 1474 



1457 

 1463 



1407 

 1414 



1402 

 1407 



1398 

 1403 



1380 

 1387 

 1362 

 1368 



<D O 



3~ 



Results 



G1& An 

 Gl only 



G1& An 

 Gl only 



Gl & An 

 Gl only 



1416 

 1423 



1346 

 1354 



1306 

 1313 



Gl, Sp & An 

 G1& An 

 G1& An 



Gl only 



Gl & An 

 Gl only 



H 



1321, 

 1326|| i 



1344H 

 11348 



1412 

 1420 



1278 

 1286 



1275 



1281 



1260 

 1264 



i 



1317 

 1319 



1278 

 1284 



1240 

 1246 



1 

 1 



1268 ~2 



1275! 2 



Gl & Sp 

 Gl only 



Gl&Sp 

 Gl only 



Gl & An 

 Gl only 



Gl & An 

 Gl only 



Gl&Fo 

 Gl only 



Gl, Fo & Sp 

 Gl only 



Gl&Sp 

 Gl only 



Gl & An 

 Gl only 



Gl & Fo 

 Gl only 



Gl & CI en 

 Gl only 



Gl&Fo 

 Gl only 



Gl & CI en 

 Gl only 



1219 1 



1223 



1240 

 1249 

 1219 



1223 



Gl,An & CI en 

 GU>nly_ 

 GT&~An 

 Glonly 

 All crystalline 

 loose powder 

 Gl, An & Tr 

 Gl & Tr 

 Gl only 



All crystalline 

 loose powder 

 Gl, Tr & An 



