Mineral Formulas and Properties
Terms
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- Picrite
- MgO 18%
- Basalt
- MgO 8%
- Granite density
- 2.6-2.7 gcm^-3
- Gabbro density
- 2.9-3.0
- Upper crust density
- 2.35
- Andesite Tm
- 1200-900
- Rhyolite Tm
- 700-900
- Basalt melting
- 1250-1000 C
- Olivine
- (Mg,Fe)2SiO4
- Pyroxene
- Ca(Mg,Fe)Si2O6
- Quartz
- SiO2
- Garnet
- (Mg,Fe,Ca)3Al2Si3O12
- Alkali Feldspar
- NaAlSi3O8 - KAlSi3O8
- Plagioclase Feldspar
- NaAlSiO3 - CaAl2Si2O8
- Biotite
- K(Mg,Fe)3[AlSi3O10](OH,F)2
- Calcite
- CaCO3
- Amphibole
- Ca2(Mg,Fe)5[Si8O22](OH,F)2
- Silicate tetrahedra
- [SiO4]4-
- Single chain
- [Si2O6]4-
- Double chain
- [Si4O11]6-
- Sheet silicate
- [Si2O5]2-
- 3D silicate framework
- SiO2
- Cuboctohedral
-
C.N. 12
Ra/Ro 1 - Cubic
-
CN 8
Ra/Ro 1-0.732 - Octahedral
-
CN 6
Ra/Ro 0.732-0.414 - Tetrahedral
-
CN 4
Ra/Ro 0.414-0.225 - Ca2+
-
8-12 fold
0.71 - Na+
-
8-12 fold
0.70 - Mg2+
-
6 fold
0.47 - Fe2+
-
6 fold
0.53 - Fe3+
-
6 fold
0.46 - Al3+
-
4 or 6 fold
0.36 - Si4+
-
4 fold
0.3 - Orthoclase
- KAlSi3O8
- Albite
- NaAlSi3O8
- Anorthite
- CaAl2Si2O8
- Hexagonal
-
1 hexad
a=b not c
alpha=beta=90, gamma=120
Cordierite - Tetragonal
-
1 tetrad
a=b not c
alpha=beta=gamma=90
Zircon and ruditite - Orthorhombic
-
3 diads
a not b not c
alpha=beta=gamma=90 - Monoclinic
-
1 diad
a not b not c
alpha=gamma= 90, beta more or equal to 90
Clinopyroxene - Triclinic
-
a not b not c
alpha not beta not gamma
Feldspar - Perovskite
-
(Mg,Fe)SiO3
CaSiO3 - Ferropericlase
- (Mg,Fe)O
- Ringwoodite
- Olivine (gamma)
- Wadsleyite
- Olivine beta
- Majorite garnet (Mj-Gt)
- (Mg3)8(MgSi)6(Si3)4O12
- Clinopyroxene (CPx)
- Ca(Mg,Fe)Si2O6
- Pyrope garnet (Gt)
-
Mg3Al2Si3O12
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