Crystal Quality
| Required Symmetries of Point Group
| Point Groups
| Space Groups
| Bravais Lattices
| Lattice System
|
Kathracite |
None |
2 |
2 |
1 |
Triclinic |
Relacite |
1 twofold axis of rotation or 1 mirror plane |
3 |
13 |
2 |
Monoclinic |
Danite |
3 twofold axes of rotation or 1 twofold axis of rotation and 2 mirror planes |
3 |
59 |
4 |
Orthorhombic |
Mephite |
1 fourfold axis of rotation |
7 |
68 |
2 |
Tetragonal |
Pontite |
1 threefold axis of rotation OR 1 sixfold axis of rotation |
5 OR 7 |
7 OR 18 OR 27 |
1 |
Rhombohedral OR Hexagonal |
Perfect |
4 threefold axes of rotation |
5 |
36 |
3 |
Cubic |