| 21. | Its chemical formula is triclinic crystals.
|
| 22. | Chabazite crystallizes in the triclinic crystal system with typically rhombohedral shaped crystals that are pseudo-cubic.
|
| 23. | The related mineral parahopeite, which has the same composition but different crystal structure, is triclinic.
|
| 24. | Triclinic, monoclinic and orthorhombic crystals have two optic axes, and are said to be biaxial.
|
| 25. | It is generally considered to be monoclinic, though optical studies have suggested it might be triclinic.
|
| 26. | Its crystal symmetry was first assigned as orthorhombic, then as monoclinic, and finally as triclinic.
|
| 27. | Kyanite is triclinic, while andalusite and sillimanite are both orthorhombic and belong to the dipyramidal point group.
|
| 28. | Also the whole parallelepiped has point symmetry " C i " ( see also triclinic ).
|
| 29. | It forms triclinic pinacoidal crystals which often occur as tubes or cylinders which are in fact rolled sheets.
|
| 30. | In total there are six crystal families : triclinic, monoclinic, orthorhombic, tetragonal, hexagonal and cubic.
|
