Crystal symmetry: 4/mmm
Density: 4,26 g/cm^3
Optical spectral range: 0,4 - 6 mkm
Elastic constants 
: 10^11 dyn/cm^2 or 10^10 Pa)
| 27.2 | 17.7 | 14.3 | 0 | 0 | 0 |
| 17.7 | 27.2 | 14.3 | 0 | 0 | 0 |
| 14.3 | 14.3 | 47.4 | 0 | 0 | 0 |
| 0 | 0 | 0 | 12.4 | 0 | 0 |
| 0 | 0 | 0 | 0 | 12.4 | 0 |
| 0 | 0 | 0 | 0 | 0 | 18.8 |
Photolastic constants 
:
| 0.01 | 0.171 | 0.16 | 0 | 0 | 0 |
| 0.171 | 0.01 | 0.16 | 0 | 0 | 0 |
| 0.097 | 0.097 | 0.06 | 0 | 0 | 0 |
| 0 | 0 | 0 | -- | 0 | 0 |
| 0 | 0 | 0 | 0 | -- | 0 |
| 0 | 0 | 0 | 0 | 0 | -- |
Refraction indices:
The values for refraction coefficients for the given optical wavelengths.
| wavelength, mkm |  |  |
|---|
| 0.546 | 2.6505 | 2.9467 |
|---|
| 0.579 | 2.6214 | 2.91 |
|---|
| 0.5893 | 2.616 | 2.903 |
|---|
| 0.607 | 2.6003 | 2.8842 |
|---|
| 0.672 | 2.5648 | 2.8397 |
|---|
| 0.691 | 2.555 | 2.8294 |
|---|
| 0.708 | 2.5495 | -- |
|---|
Sound velocity:
| direction | polarization | v (10^5 cm/s) |
|---|
| [100] | [100], L | 8.014 |
| [100] | [010], S | 6.756 |
| [100] | [001], S | 5.424 |
| [110] | [110], L | 9.935 |
| [110] | [1-10], S | 3.3 |
| [110] | [100], S | 5.389 |
| [001] | [110], S | 5.399 |
| [010] | [010], L | 7.958 |
| [001] | [001], L | 10.94 |
| [010] | [100], S | 6.7 |
Paratellurite slowness surfaces in important planes
Acousto-optic figure of merit:
| sound dir. | sound pol. | light dir. | light pol. | M (10^-18 s^3/g) |
|---|
| [001] | [001] | [100] | [010] | 15.2 |
| [001] | [001] | [100] | [001] | 4.4 |
| [100] | [100] | -- | [001] | 23.7 |
| [100] | [100] | -- | [010] | 42.1 |
| [100] | [010] | -- | [010] | 11.8 |
