1
Q
Cubic
A
a = b = c
alpha = beta = gamma = 90°
2
Q
Orthorhombic
A
a ≠ b ≠ c
alpha = beta = gamma = 90°
3
Q
Monoclinic
A
a ≠ b ≠ c
alpha = gamma = 90°
beta ≠ 90° ≠ 120°
4
Q
Triclinic
A
a ≠ b ≠ c
alpha ≠ beta ≠ gamma ≠ 90° ≠ 120°
5
Q
Tetragonal
A
a = b ≠ c
alpha = beta = gamma = 90°
6
Q
Hexagonal and Trigonal
A
a = b ≠ c
alpha = beta = 90°
gamma = 120°
7
Q
Isometric minerals
A
cubic xtal system
8
Q
Uniaxial minerals
A
tetragonal
hexagonal/trigonal
9
Q
Biaxial minerals
A
orthorhombic
monoclinic
triclinic
