Mineral phases available in MAGEMin calculations
A couple of common questions we receive are “Can MELTS/MAGEMin predict X phase?” and “Can MELTS/MAGEMin model Y component in X phase?”
To try and help all users understand the capabilities and limitations of each thermodynamic, the available phases of each model used in MAGEMin (and available through PetThermoTools) are listed below.
Note
This list is adapted from the the MAGEMin documentation https://computationalthermodynamics.github.io/MAGEMin_C.jl/dev/
Green et al. (2025) - named ig in MAGEMin
\(K_2O - Na_2O - CaO - FeO - MgO - Al_2O_3 - SiO_2 - H_2O - TiO_2 - O - Cr_2O_3\) chemical system
Note
In PetThermoTools we specify an fO2 buffer and/or an Fe redox state so the O content of the system is defined indirectly by one of these two parameters.
Pure phases
quartz \(SiO_2\)
cristobalite \(SiO_2\)
tridymite \(SiO_2\)
coesite \(SiO_2\)
stishovite \(SiO_2\)
kyanite \(Al_2O_5\)
sillimanite \(Al_2O_5\)
andalusite \(Al_2O_5\)
rutile \(TiO_2\)
sphene \(CaTiSiO_5\)
Solution phases
Note
All Fe is 2+ valence unless specified. End member information taken from https://hpxeosandthermocalc.org/the-hpx-eos/the-hpx-eos-families/hpx-eos-igneous-sets
- olivine
mont \(CaMgSiO_4\)
fa \(Fe_2SiO_4\)
fo \(Mg_2SiO_4\)
cfm \(MgFeSiO_4\) (ordered - Mg in M1, Fe in M2)
- feldspar
ab \(NaAlSi_3O_8\)
san \(KAlSi_3O_8\)
an \(CaAl_2Si_2O_8\)
- clinopyroxene
di \(CaMgSi_2O_6\)
cfs \(Fe_2Si_2O_6\)
cats \(CaAl_2SiO_6\)
crdi \(CaCrAlSiO_6\)
cess \(CaFe^{3+}AlSiO_6\)
cbuf \(Ca_{1.5}AlTi_{0.5}SiO_6\)
jd \(NaAlSi_2O_6\)
cen \(Mg_2Si_2O_6\)
cfm \(MgFeSi_2O_6\) (ordered - Mg in M1, Fe in M2)
kjd \(KAlSi_2O_6\)
- orthopyroxene
en \(Mg_2Si_2O_6\)
fs \(Fe_2Si_2O_6\)
fm \(MgFeSi_2O_6\) (ordered - Mg in M1, Fe in M2)
odi \(CaMgSi_2O_6\)
mgts \(MgAl_2SiO_6\)
cren \(MgCrAlSiO_6\)
obuf \(Mg_{1.5}AlTi_{0.5}SiO_6\)
mess \(MgFe^{3+}AlSiO_6\)
ojd \(NaAlSi_2O_6\)
- garnet
py \(Mg_3Al_2Si_3O_{12}\)
alm \(Fe_3Al_2Si_3O_{12}\)
gr \(Ca_3Al_2Si_3O_{12}\)
andr \(Ca_3Fe^{3+}_2Si_3O_{12}\)
knor \(Mg_3Cr_2Si_3O_{12}\)
tig \(Mg_{3.5}AlTi_{0.5}Si_3O_{12}\)
- clino-amphibole
tr \(Ca_2Mg_5Si_8O_{22}(OH)_2\)
tsm \(Ca_2Mg_3Al_4Si_6O_{22}(OH)_2\)
prgm \(NaCa_2Mg_4Al_3Si_6O_{22}(OH)_2\)
cumm \(Mg_7Si_8O_{22}(OH)_2\)
grnm \(Fe_7Si_8O_{22}(OH)_2\)
a \(Mg_3Fe_4Si_8O_{22}(OH)_2\) (ordered - Fe in M4 and M2, Mg in M1 and M3)
b \(Mg_2Fe_5Si_8O_{22}(OH)_2\) (ordered - Fe in M1, M3, and M4, Mg in M2)
mrb \(Na_2Mg_3Fe^{3+}_2Si_8O_{22}(OH)_2\)
kprg \(KCa_2Mg_4Al_3Si_6O_{22}(OH)_2\)
tts \(Ca_2Mg_3Al_2Ti_2Si_6O_{24}\)
- spinel
nsp \(MgAl_2O_4\) (ordered)
isp \(MgAl_2O_4\) (ordered, inverse)
nhc \(FeAl_2O_4\) (ordered)
ihc \(FeAl_2O_4\) (ordered, inverse)
nmt \(FeFe^{3+}_2O_4\) (ordered)
imt \(FeFe^{3+}_2O_4\) (ordered, inverse)
picr \(MgCr_2O_4\)
usp \(Fe_2TiO_4\)
- biotite
phl \(KMg_3AlSi_3O_{10}(OH)_2\)
annm \(KFe_3AlSi_3O_{10}(OH)_2\)
obi \(KMg_2FeAlSi_3O_{10}(OH)_2\) (ordered - Fe in M3 site)
est \(KMg_2Al_3Si_2O_{10}(OH)_2\)
tbi \(KMg_2AlSi_3TiO_{12}\)
fbi \(KMg_2Al_2Fe^{3+}Si_2O_{10}(OH)_2\)
- cordierite
crd \(Mg_2Al_4Si_5O_{18}\)
fcrd \(Fe_2Al_4Si_5O_{18}\)
hcrd \(Mg_2Al_4Si_5O_{17}(OH)_2\)
- epidote
cz \(Ca_2Al_3Si_3O_{12}(OH)\)
ep \(Ca_2FeAl_2Si_3O_{12}(OH)\)
fep \(Ca_2Fe_2AlSi_3O_{12}(OH)\)
- ilmenite
oilm \(FeTiO_3\) (Fe in A site, Ti in B)
dilm \(FeTiO_3\) (Fe and Ti split across A and B)
hem \(Fe^{3+}_2O_3\)
ogk \(MgTiO_3\) (Mg in A site, Ti in B)
dgk \(MgTiO_3\) (Mg and Ti split across A and B)
- muscovite
mu \(KAl_3Si_3O_{12}(OH)_2\)
cel \(KMgAlSi_4O_{10}(OH)_2\)
fcel \(KFeAlSi_4O_{10}(OH)_2\)
pa \(NaAl_3Si_3O_{10}(OH)_2\)
mat \(CaAl_4Si_2O_{10}(OH)_2\)
fmu \(KAl_2Fe^{3+}Si_3O_{12}(OH)2\)
- silicate melt
q4L \(Si_4O_8\)
slL \(Al_2SiO_5\)
wo1L \(CaSiO3\)
fo2L \(Mg_4Si_2O_8\)
fa2L \(Fe_4Si_2O_8\)
jdL \(NaAlSi_2O_6\)
hml \(Fe^{3+}O_{1.5}\)
ekl \(CrO_{1.5}\)
tiL \(TiO_2\)
kjL \(KAlSi_2O_6\)
ctL \(CaAl_2SiO_6\)
h2O1L \(H_2O\)
fluid
Weller et al. (2024) - named igad in MAGEMin
\(K_2O - Na_2O - CaO - FeO - MgO - Al_2O_3 - SiO_2 - TiO_2 - O - Cr_2O_3\) chemical system
Note
In PetThermoTools we specify an fO2 buffer and/or an Fe redox state so the O content of the system is defined indirectly by one of these two parameters. Additionally, the Weller et al. (2024) model is currently anhydrous.
Pure phases
quartz \(SiO_2\)
cristobalite \(SiO_2\)
tridymite \(SiO_2\)
coesite \(SiO_2\)
stishovite \(SiO_2\)
kyanite \(Al_2O_5\)
sillimanite \(Al_2O_5\)
andalusite \(Al_2O_5\)
rutile \(TiO_2\)
sphene \(CaTiSiO_5\)
Solution phases
Note
All Fe is 2+ valence unless specified. End member information taken from https://hpxeosandthermocalc.org/the-hpx-eos/the-hpx-eos-families/hpx-eos-igneous-sets
- olivine
mont \(CaMgSiO_4\)
fa \(Fe_2SiO_4\)
fo \(Mg_2SiO_4\)
cfm \(MgFeSiO_4\) (ordered - Mg in M1, Fe in M2)
- feldspar
ab \(NaAlSi_3O_8\)
san \(KAlSi_3O_8\)
an \(CaAl_2Si_2O_8\)
- clinopyroxene
di \(CaMgSi_2O_6\)
cfs \(Fe_2Si_2O_6\)
cats \(CaAl_2SiO_6\)
crdi \(CaCrAlSiO_6\)
cess \(CaFe^{3+}AlSiO_6\)
cbuf \(Ca_{1.5}AlTi_{0.5}SiO_6\)
jd \(NaAlSi_2O_6\)
cen \(Mg_2Si_2O_6\)
cfm \(MgFeSi_2O_6\) (ordered - Mg in M1, Fe in M2)
kjd \(KAlSi_2O_6\)
- orthopyroxene
en \(Mg_2Si_2O_6\)
fs \(Fe_2Si_2O_6\)
fm \(MgFeSi_2O_6\) (ordered - Mg in M1, Fe in M2)
odi \(CaMgSi_2O_6\)
mgts \(MgAl_2SiO_6\)
cren \(MgCrAlSiO_6\)
obuf \(Mg_{1.5}AlTi_{0.5}SiO_6\)
mess \(MgFe^{3+}AlSiO_6\)
ojd \(NaAlSi_2O_6\)
- garnet
py \(Mg_3Al_2Si_3O_{12}\)
alm \(Fe_3Al_2Si_3O_{12}\)
gr \(Ca_3Al_2Si_3O_{12}\)
andr \(Ca_3Fe^{3+}_2Si_3O_{12}\)
knor \(Mg_3Cr_2Si_3O_{12}\)
tig \(Mg_{3.5}AlTi_{0.5}Si_3O_{12}\)
- spinel
nsp \(MgAl_2O_4\) (ordered)
isp \(MgAl_2O_4\) (ordered, inverse)
nhc \(FeAl_2O_4\) (ordered)
ihc \(FeAl_2O_4\) (ordered, inverse)
nmt \(FeFe^{3+}_2O_4\) (ordered)
imt \(FeFe^{3+}_2O_4\) (ordered, inverse)
picr \(MgCr_2O_4\)
usp \(Fe_2TiO_4\)
- ilmenite
oilm \(FeTiO_3\) (Fe in A site, Ti in B)
dilm \(FeTiO_3\) (Fe and Ti split across A and B)
hem \(Fe^{3+}_2O_3\)
ogk \(MgTiO_3\) (Mg in A site, Ti in B)
dgk \(MgTiO_3\) (Mg and Ti split across A and B)
- nepheline
neN \(Na_4Al_4Si_4O_{16}\)
neS \(Na_3Al_3Si_5O_{16}\) (vacancy in A2 site)
neK \(K_4Al_4Si_4O_{16}\)
neO \(Na_3KAl_4Si_4O_{16}\) (ordered - Na in A1, K in A2)
neC \(Na_2CaAl_4Si_4O_{16}\) (vacancy in A2 site)
neF \(Na_4Fe^{3+}_4Si_4O_{16}\)
- kalsilite
nks \(NaAlSiO_4\)
kls \(KAlSiO_4\)
- leucite
nlc \(NaAlSi_2O_6\)
lc \(KAlSi_2O_6\)
- melilite
geh \(Ca_2Al_2SiO_7\)
ak \(Ca_2MgSi_2O_7\)
fak \(Ca_2FeSi_2O_7\)
nml \(NaCaAl_2SiO_7\)
fge \(Ca_2Fe^{3+}AlSiO_7\)
- silicate melt
q3L \(Si_3O_6\)
sl1L \(Al_2SiO_5\)
wo1L \(CaSiO_3\)
fo2L \(Mg_4Si_2O_8\)
fa2L \(Fe_4Si_2O_8\)
nml \(NaSi_{0.5}O_{1.5}\)
hml \(Fe^{3+}O_{1.5}\)
ekl \(CrO_{1.5}\)
tiL \(TiO_2\)
kmL \(KSi_{0.5}O_{1.5}\)
anL \(CaAl_2Si_2O_8\) (ordered)
ab1L \(NaAlSi_3O_8\) (ordered)
kfL \(KAlSi_3O_8\) (ordered)
enL \(Mg_2Si_2O_6\) (ordered)