Crystal symmetry: m3m
Density: 7,192 g/cm^3
Optical spectral range: 0,4 - 30 mkm
Elastic constants 
: 10^11 dyn/cm^2 or 10^10 Pa)
| 3.96 | 1.42 | 1.42 | 0 | 0 | 0 |
| 1.42 | 3.96 | 1.42 | 0 | 0 | 0 |
| 1.42 | 1.42 | 3.96 | 0 | 0 | 0 |
| 0 | 0 | 0 | 0.78 | 0 | 0 |
| 0 | 0 | 0 | 0 | 0.78 | 0 |
| 0 | 0 | 0 | 0 | 0 | 0.78 |
Photolastic constants 
:
| 0.29 | 0.26 | 0.26 | 0 | 0 | 0 |
| 0.26 | 0.29 | 0.26 | 0 | 0 | 0 |
| 0.26 | 0.26 | 0.29 | 0 | 0 | 0 |
| 0 | 0 | 0 | 0.17 | 0 | 0 |
| 0 | 0 | 0 | 0 | 0.17 | 0 |
| 0 | 0 | 0 | 0 | 0 | 0.17 |
Refraction indices:
The values for refraction index for the given optical wavelengths.
| wavelength, mkm | refraction index |
|---|
| 0.6 | 2.3294 |
|---|
| 0.7 | 2.2892 |
|---|
| 0.8 | 2.266 |
|---|
| 0.9 | 2.251 |
|---|
| 1 | 2.2404 |
|---|
| 1.2 | 2.2255 |
|---|
| 1.4 | 2.2176 |
|---|
| 1.6 | 2.2124 |
|---|
| 1.8 | 2.2086 |
|---|
| 2 | 2.2059 |
|---|
| 2.4 | 2.2024 |
|---|
| 2.8 | 2.2001 |
|---|
| 3.5 | 2.1972 |
|---|
| 4 | 2.1956 |
|---|
| 4.5 | 2.1942 |
|---|
| 5 | 2.1928 |
|---|
| 6 | 2.19 |
|---|
| 8 | 2.1839 |
|---|
| 10 | 2.1767 |
|---|
| 14 | 2.1563 |
|---|
| 18 | 2.1309 |
|---|
| 22 | 2.0976 |
|---|
Sound velocity:
| direction | polarization | v (10^5 cm/s) |
|---|
| [100] | [100], L | 2.416 |
| [110] | [110], L | 2.217 |
| [100] | [110], S | 1.0278 |
| [111] | [111], L | 2.28 |
KRS-6 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] | 16 |
| [100] | [100] | -- | [010] | 96 |
| [100] | [010] | -- | [100] | 152 |
| [111] | [111] | -- | [111] | 84 |
| [111] | [111] | -- | [1-10] | 75 |
| [110] | [110] | -- | [110] | 45 |
