Crystal symmetry: 42m
Density: 1,803 g/cm^3
Optical spectral range: 0,2 - 1,2 mkm
Elastic constants 
: 10^11 dyn/cm^2 or 10^10 Pa)
| 6.82 | 0.498 | 2.02 | 0 | 0 | 0 |
| 0.498 | 6.82 | 2.02 | 0 | 0 | 0 |
| 2.02 | 2.02 | 3.39 | 0 | 0 | 0 |
| 0 | 0 | 0 | 0.866 | 0 | 0 |
| 0 | 0 | 0 | 0 | 0.866 | 0 |
| 0 | 0 | 0 | 0 | 0 | 0.606 |
Photolastic constants 
:
| -0.11 | -0.16 | -0.84 | 0 | 0 | 0 |
| -0.16 | -0.11 | -0.84 | 0 | 0 | 0 |
| 0.19 | 0.19 | -0.7 | 0 | 0 | 0 |
| 0 | 0 | 0 | -- | 0 | 0 |
| 0 | 0 | 0 | 0 | -- | 0 |
| 0 | 0 | 0 | 0 | 0 | -0.099 |
Refraction indices:
The values for refraction index for the given optical wavelengths.
| wavelength, mkm |  |  |
|---|
| 0.2 | 1.6491 | 1.5877 |
|---|
| 0.3 | 1.564 | 1.5128 |
|---|
| 0.4 | 1.5408 | 1.4926 |
|---|
| 0.5 | 1.5303 | 1.4838 |
|---|
| 0.6 | 1.524 | 1.4789 |
|---|
| 0.7 | 1.5195 | 1.4757 |
|---|
| 0.8 | 1.5158 | 1.4733 |
|---|
| 0.9 | 1.5124 | 1.4713 |
|---|
| 1 | 1.5092 | 1.4696 |
|---|
| 1.1 | 1.5059 | 1.4679 |
|---|
| 1.2 | 1.5024 | 1.4663 |
|---|
| 1.3 | 1.4989 | 1.4647 |
|---|
| 1.4 | 1.4951 | 1.463 |
|---|
| 1.5 | 1.4912 | 1.4613 |
|---|
| 1.6 | 1.487 | 1.4596 |
|---|
| 1.7 | 1.4826 | 1.4577 |
|---|
| 1.8 | 1.4779 | 1.4558 |
|---|
| 1.9 | 1.473 | 1.4538 |
|---|
| 2 | 1.4678 | 1.4517 |
|---|
Sound velocity:
| direction | polarization | v (10^5 cm/s) |
|---|
| [100] | [100] | 6.16 |
| [001] | [001] | 4.35 |
| [100] | [010] | 1.83 |
KRS-5 slowness surfaces in important planes
Acousto-optic figure of merit:
| sound dir. | sound pol. | light dir. | light pol. | M (10^-18 s^3/g) |
|---|
| [100] | [100] | -- | [100] | 2.69 |
| [001] | [001] | -- | [001] | 3.64 |
| [100] | [010] | -- | [100] | 6.43 |
