MgOFeOSiO2

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• MgO-FeO-SiO2
• FeO and MgO showing
• a solid soln

Fig. 6.59. System MgO-FeO-SiO2 including binary
systems.
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SiO2
2900C
2700C
2000C
L
L
MgO
FeO
LM
M
LM
Magnesiowustite
1870C
1860C
solid solubility
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1550C
1527C
two pts meet at 1543C
XL
XL
XP
PL
PL
OP
OP
OL
OL
MO
MO
ML
ML
pyroxene (P) is (MgO,FeO)SiO2 cristobalite (X)
transformed to tridymite (T) at 1470oC
1450C
TL
PT
TPL and OPL meet at 1305C, and PL disappears
PL
OP
OL
MO
ML
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• the relation between the structure of a ternary
  diffusion couple and the phase diagram