98 Ferguson and Merwin — The Ternary System. 



Phases present Boundary 



Glass -f CaO.Mg0.2Si0 2 + 



2CaO.MgO.2SiO, 3, 4 



Glass + 2CaO.Mg0.2Si0 2 

 Glass + 2CaO.Mg0.2Si0 2 

 Glass 4- 2CaO.Mg0.2SiOo + 



CaO.Mg6.2Si0 2 

 Glass -f trace 2CaO.Mg0.2Si0 2 

 + trace CaO.Mg0.2SiO" 2 

 Glass -f CaO.Mg0.2Si0 2 4, 5 



No glass 

 Glass + trace CaO.MgO.2SiO., 



+ 2MgO.Si0 2 

 Glass + 2MgO.Si0 2 

 Glass + 2MgO.Si0 2 -f 



CaO.MgO.2SiO, 

 Glass 4. 2MgO.Si0 2 

 Glass 4- 2MgO.Si0 2 4-trace 



CaO.MgO.2SiO, 

 Glass 4- 3Ca0.2Si0 2 6, D 



Glass 4- 3Ca0.2SiOo + aCaO.SiO, 

 Glass 4. a CaO.Si0 2 + 3Ca0.2Si0 2 

 Glass -f- trace crystals 

 Glass -J- 2CaO.SiO, -f 



3Ca0.2SiO, 7, C 

 Glass 4-2CaO.Si0 2 

 Glass -J- 2CaO.SiO~, + trace 



3Ca0.2Si0 2 

 Glass 4- a CaO.Si0 2 3, 13, 6 



Glass 4- aCaO.SiO, + 



2CaO.Mg0.2Si0 2 

 Glass 4- a CaO.Si0 2 -f 



2CaO.MgO.2SiO, 

 Glass + 2CaO.Mg0.2Si0 2 

 Glass + aCaO.Si0 2 

 Glass -f a CaO.Si0 2 + 



2CaO.Mg0.2Si0 2 

 Glass 4- a Ca0.Si0 2 4. 



2CaO.Mg0.2Si0 2 

 Glass 4- 2CaO.Mg0.2Si0 2 

 Glass 4- aCaO.SiO, 

 Glass 4- aCaO.SiO, 4. 



2CaO.Mg0.2Si0 2 

 Glass 4- trace <xCaO.Si0 2 4- trace 



2CaO.MgO.2SiO, 

 Glass 4- 2CaO.SiO, 4- 



2CaO.Mg0.2Si0 2 7, 8 



Glass 

 Glass 4- 2CaO.SiO, 4- trace 



2CaO.MgO.2SiO, 

 Glass 4- 2CaO.Si0 2 

 Glass + 2CaO.SiO, + 



2CaO.Mg0.2Si0 2 

 Glass 4- 2CaO.SiO, 4. 



2CaO.Mg0.2Si0 2 

 Glass 



Glass 8, 9 



Glass 4- 2CaO.MgO.2SiO, 4- 



CaO.MgO.SiO, 



Compositiori 

 CaO MgO 



rwt. % 

 SiO a 



Temp. 



°C. 



Time 



in 



min. 



32 



18 



50 



1365 



20 



33 



16-5 



50-5 



1371 

 1367 

 1364 



20 

 20 

 20 



34 



15 



51 



1361 



20 



23 

 25 



22-5 

 22 



54-5 

 53 



1383 

 1379 

 1383 



20 

 20 

 20 



26 



23 



51 



1388 

 1375 



20 

 20 



29 



21 



50 



1380 

 1365 



20 

 20 



50 



51-5 



51 



5 



3-5 



5 



45 

 45 

 44 



1384 

 1378 

 1410 

 1417 

 1404 



20 

 20 

 10 

 10 

 15 



53 



3 



44 



1410 

 1430 



15 



15 



37 



12 



51 



1367 

 1362 



15 

 15 



38 



12 



50 



1375 



25 



42-4 



8-8 



48-8 



1381 

 1403 

 1398 



25 

 15 

 15 



44 



8-5 



47-5 



1402 



20 



45 



8 



47 



1406 

 1409 

 1403 



20 

 15 

 15 



47 



7 



46 



1393 



30 



49 



7 



44 



1405 



15 



47 



9 



44 



1410 

 1422 



15 

 15 



45 



12 



43 



1440 

 1432 



20 

 15 



42 



14-5 



43-5 



1448 



15 



26 



20-5 



43-5 



1453 

 1445 



1438 



15 

 20 

 15 



