Skeleton formulas Flashcards
1
Q
Framework Silicates
A
VII-XII A 0-2 [T4O8]
2
Q
T-O-T and T-O-T-A sheet silicates
A
XIIA0-1 VIM2-3 {T4O10](OH)2
Ex: talc _ Mg3Si4O10(OH)2
3
Q
T-O and T-O-T-O sheet silicates
A
VIM4-6 {T4O10](OH)8
Ex: chlorite or serpentine
4
Q
Amphiboles
A
XIIA0-1 VIIIM2VIM5 {T8O22](OH)2
Ex: Tremolite - _ Ca2Mg5T8O22(OH)2
5
Q
Pyroxenes
A
VI-VIIIM VIM {T2O6]
6
Q
Zircon type nesosilicates
A
VIIIM {TO4]
7
Q
Olivine nesosilicates
A
VIM VIM {TO4]
8
Q
Nesosilicates with extra O, OH, and F
A
IV-VIIIM VIM {TO4]O
Ex: kyanite Al2O[SiO4]
9
Q
Garnets and similar nesosilicates
A
VIIIM 3 VIM 2 {TO4]4
10
Q
Isometric system
A
a=b=c
α=β=γ=90
11
Q
Trigonal
A
a=b=c
α=β=γ=\90
12
Q
tetragonal
A
a=b=\c
α=β=γ=90
13
Q
hexagonal
A
a=b=\c
α=β=90 γ=120
14
Q
Orthorhombic
A
a=\b=\c
α=β=γ=90
15
Q
Monoclinic
A
a=\b=\c
α=γ=90 β=\90
16
Q
triclinic
A
a=\b=\c
α=\β=\γ=\90
17
Q
A
