Crystal symmetry: m3m
Density: 7,36 g/cm^3
Optical spectral range: 0,53 - 50 mkm
Elastic constants 
: 10^11 dyn/cm^2 or 10^10 Pa)
| 3.36 | 1.41 | 1.41 | 0 | 0 | 0 |
| 1.5 | 3.36 | 1.41 | 0 | 0 | 0 |
| 1.5 | 1.5 | 3.36 | 0 | 0 | 0 |
| 0 | 0 | 0 | 0.565 | 0 | 0 |
| 0 | 0 | 0 | 0 | 0.565 | 0 |
| 0 | 0 | 0 | 0 | 0 | 0.565 |
Photolastic constants 
:
| 0.213 | 0.146 | 0.146 | 0 | 0 | 0 |
| 0.146 | 0.213 | 0.146 | 0 | 0 | 0 |
| 0.146 | 0.146 | 0.213 | 0 | 0 | 0 |
| 0 | 0 | 0 | 0.149 | 0 | 0 |
| 0 | 0 | 0 | 0 | 0.149 | 0 |
| 0 | 0 | 0 | 0 | 0 | 0.149 |
Refraction indices:
The values for refraction index for the given optical wavelengths.
| wavelength, mkm |  |  |
|---|
| 0.6 | 2.6166 | 2.6166 |
|---|
| 0.7 | 2.5434 | 2.5434 |
|---|
| 0.8 | 2.5022 | 2.5022 |
|---|
| 0.9 | 2.4781 | 2.4781 |
|---|
| 1 | 2.4611 | 2.4611 |
|---|
| 1.2 | 2.4374 | 2.4374 |
|---|
| 1.4 | 2.4254 | 2.4254 |
|---|
| 1.6 | 2.4163 | 2.4163 |
|---|
| 1.8 | 2.411 | 2.411 |
|---|
| 2 | 2.4068 | 2.4068 |
|---|
| 2.2 | 2.4036 | 2.4036 |
|---|
| 2.6 | 2.3993 | 2.3993 |
|---|
| 3 | 2.3966 | 2.3966 |
|---|
| 3.5 | 2.3943 | 2.3943 |
|---|
| 4 | 2.3928 | 2.3928 |
|---|
| 5 | 2.3906 | 2.3906 |
|---|
| 6 | 2.3889 | 2.3889 |
|---|
| 8 | 2.3856 | 2.3856 |
|---|
| 10 | 2.3818 | 2.3818 |
|---|
| 15 | 2.3694 | 2.3694 |
|---|
| 20 | 2.3524 | 2.3524 |
|---|
| 25 | 2.3299 | 2.3299 |
|---|
| 30 | 2.3032 | 2.3032 |
|---|
Sound velocity:
| direction | polarization | v (10^5 cm/s) |
|---|
| -- | L | 2.078 |
| -- | S | 3.75 |
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] | L | -- | [100] | 175 |
| [100] | L | -- | [010] | 275 |
| [111] | L | -- | [111] | 1150 |
| [111] | L | -- | [1-10] | 260 |
