| Lucobit displays superior tenacity, biaxial stretchability, and flexibility even at low temperatures. |
| The plate and bridges are embellished with two different diameters of perlage, an original biaxial Côtes de Genève and a traits tirés treatment. |
| A biaxial crystal, one having two optic axes, will exhibit trichroism, in which three colours, sometimes called face colours, may be observed. |
| It has no cleavage or parting and is biaxial positive, nonpleochroic, and monoclinic. |
| Though closely resembling the tetragonal torbernite in form, it crystallizes in the orthorhombic system and is optically biaxial. |
| For optical data, the measured 2V of a biaxial mineral can be checked against 2V calculated from the three principal indices of refraction. |
