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Cubic (Isometric)
crystallographic axis and Axial Angle
a:a:a α=β=Υ=90°
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Tetragonal
crystallographic axis and Axial Angle
a:a:c α=β=γ=90°
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Hexagonal
crystallographic axis and Axial Angle
a:a:a:c α=β=90°, γ=60-120°
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Orthorombic
crystallographic axis and Axial Angle
a:b:c α=β=γ=90°
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Monoclinic
crystallographic axis and Axial Angle
a:b:c α=γ=90°, β>90°
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Triclinic
crystallographic axis and Axial Angle
a:b:c α≠β≠γ≠90°
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For the general structure X#Y#Z#O#
What is the CN for X, Y, & Z
X= cubic (CN 8)
Y= Octahedral (CN 6)
Z= Tetrahedral (CN 4)
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Olivine Solid Solution
Y2ZO4
Y=Mg, Fe Z=Si
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Olivine End Members (2)
Forsterite Mg2SiO4
Fayalite Fe2SiO4
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Forsterite
olivine family
Mg2SiO4
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Fayalite
Olivine family
Fe2SiO4
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Garnet solid Solutuion
X3Y2Z3O12
X= Ca, Mg, Fe
Y=Al, Fe3+
Z=Si
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Garnet End Members (4)
grossular Ca 3Al 2Si 3O 12
pyrope Mg 3Al 2Si 3O 12- almandine Fe3Al2Si3O12
andradite Ca3Fe2Si3O12
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Grossular
Garnnet family
Ca3Al2Si3O12
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Pyrope
Garnet family
Mg3Al2Si3O12
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almandine
garnet family
Fe3Al2Si3O12
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andradite
garnet Family
Ca3Fe2Si3O12
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Feldspar Solid Solution
MZ4O8
M=Ca, Na, Al
Z=Al3+, Si
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Feldspar End Members (3)
orthoclase KAlSi3O8
albite NaAlSi3O8
anorthite CaAl2Si2O8
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Orthoclase
Feldspar family
KAlSi3O8
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Albite
Feldspar Family
NaAlSi3O8
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anorthite
feldspar family
CaAl2Si2O8
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Orthopyroxene Solid Sollution
Y2Z2O6
Y=Mg, Fe
Z=Si
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Orthopyroxene end members (2)
estatite Mg2Si2O6
ferrosilite Fe2Si2O6
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Enstatite
Orthopyroxene family
Mg2Si2O6
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Ferrosilite
Orthopyroxene group
Fe2Si2O6
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Clinopyroxene Solid Sollution
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Clinopyroxene Endmembers (2)
diopside CaMgSi2O6
hedenbergite CaFeSi2O6
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