Formulas
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Rock Forming Silicates
Unit Cells
100
CaAl2Si2O8
What is Anthorite?
100
Mg2SiO4
What is Forsterite?
100
Tetrahedra linked via cations; olivine; ABZO4
What are nesosilicates?
100
The angle between equivalent pairs of faces on different crystals of the same substance are always equal (at the same temperature and pressure)
What is Steno's Law (Law of Constancy of Interfacial Angles)?
200
NaAlSi3O8
What is Albite?
200
Enstatite (ortho-pyroxene)
What is MgSiO3?
200
Polymerized sheets of silica tetrahedra; WB2-3 Z4 O10(OH)2; Mica
What are Phyllosilicates?
200
Tiny pieces of a mineral of constant size that could be stacked to form the mineral OR the smallest part of the atomic lattice structure that possesses the chemistry and geometry of the mineral as a whole
What is Fundamental Polyhedra (unit cell)?
300
Muscovite
What is K(Al2)(AlSi3O10)(OH)2?
300
(Mg,Fe)7Si8O22(OH)2
What is ortho-amphibole?
300
Chain Silicates; ABZ2O6; eg. Pyroxenes and Amphiboles
What are inosilicates?
300
A simple mathematical relation exists between all planes that are possible faces on crystals of the same substance
What is Hauy's Law (Law of Rational Indicies)?
400
Potassium Feldspar
What is KAlSi3O8?
400
Plagioclase Feldspar (Bytownite, Labradorite, Andesite)
What is (Ca,Na)(Al,Si)AlSi2O8?
400
3D silica network; A0/1ZxO2x; feldspars, feldspathoids, quartz
What are tectosilicates?
400
6 cystal systems
What are cubic/isometric, tetragonal, orthorhombic, monoclinic, triclinic, hexagonal?
500
"Clino" Amphibole
What is Ca2(Mg,Fe)5Si8O22(OH)2
500
Biotite
What is K(Mg,Fe)3(AlSi3O10)(OH)2?
500
Augite
What is an inosilicate(clino-pyroxene)?
500
Maximum Symmetry Zircon (Tetragonal)
What is 4/M 2/M 2/M?
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