1. Isometric System/
Cubic system |
3 equal axes at right
angle to each others
9 planes of symmetry
13 axes of symmetry
1 center of symmetry
Ideal crystal form: Cube, Octahedron & Dodecahedron.
e.g. Diamond, Garnet, Fluorite, Spinel |
Garnet |
| 2. Tetragonal System |
3 equal axes at right
angle to each others
5 planes of symmetry
5 axes of symmetry
1 center of symmetry
Ideal crystal form: Tetragonal prism with square base or bipyramid
e.g. Zircon |
Zircon |
3. Hexagonal System
4. Trigonal System
|
| Hexagonal System |
Trigonal System |
| 3 horizontal axes
are equal in length & cut each others at 120°,
all perpendicular to the vertical axis of unequal length |
| 7 planes of
symmetry |
3 planes of symmetry |
| 7 axes of symmetry |
4 axes of symmetry |
Ideal
crystal form: Hexagonal prism with 6-sided base or bipyramid. |
Ideal crystal
form: Rhombohombic, Trigonal prism on triangular base |
| 1 center of symmetry |
| Beryl |
Quartz, Corundum, Tourmaline |
|
Quartz |
| 5. Triclinic
System |
3 axes of unequal length,
all inclined to each others
0 planes of symmetry
0 axes of symmetry
1 center of symmetry
Ideal crystal form: Prism, Pinacoids, Domes
e.g. Turquoise |
Turquoise |
| 6. Monoclinic
System |
3 axes of unequal length,
2 included, 1 perpendicular to their plane
1 planes of symmetry
1 axes of symmetry
1 center of symmetry
Ideal crystal form: Prisms, Pinacoids
e.g. Jadeite, Nephrite |
Gypsum |
7. Rhorhombic
System/
Orthorhombic System |
3 axes of unequal length,
all perpendicular to each others
3 planes of symmetry
3 axes of symmetry
1 center of symmetry
Ideal crystal form: Prism on rectangular base or bipyramid
e.g. Topaz, Chrysoberyl, Peridot |
Peridot |
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