Crystal symmetry: -42m
Density: 2,338 g/cm^3
Optical spectral range: 0,25 - 1,7 mkm
Elastic constants 
: 10^11 dyn/cm^2 or 10^10 Pa)
| 7.15 | -0.57 | 1.33 | 0 | 0 | 0 |
| -0.57 | 7.15 | 1.33 | 0 | 0 | 0 |
| 1.33 | 1.33 | 5.61 | 0 | 0 | 0 |
| 0 | 0 | 0 | 1.27 | 0 | 0 |
| 0 | 0 | 0 | 0 | 1.27 | 0 |
| 0 | 0 | 0 | 0 | 0 | 0.62 |
Photolastic constants 
:
| 0.253 | 0.24 | 0.24 | 0 | 0 | 0 |
| 0.24 | 0.253 | 0.24 | 0 | 0 | 0 |
| 0.223 | 0.223 | 0.216 | 0 | 0 | 0 |
| 0 | 0 | 0 | 0.09 | 0 | 0 |
| 0 | 0 | 0 | 0 | 0.09 | 0 |
| 0 | 0 | 0 | 0 | 0 | -0.061 |
Refraction indices:
The values for refraction coefficients for the given optical wavelengths.
| wavelength, mkm |  |  |
|---|
| 0.2 | 1.6226 | 1.5639 |
|---|
| 0.3 | 1.5456 | 1.4982 |
|---|
| 0.4 | 1.5245 | 1.4802 |
|---|
| 0.5 | 1.5149 | 1.4725 |
|---|
| 0.6 | 1.5093 | 1.4683 |
|---|
| 0.7 | 1.5052 | 1.4656 |
|---|
| 0.8 | 1.5019 | 1.4637 |
|---|
| 0.9 | 1.4989 | 1.4622 |
|---|
| 1 | 1.496 | 1.461 |
|---|
| 1.1 | 1.4931 | 1.4599 |
|---|
| 1.2 | 1.4902 | 1.4588 |
|---|
| 1.3 | 1.4871 | 1.4578 |
|---|
| 1.4 | 1.4838 | 1.4568 |
|---|
| 1.5 | 1.4804 | 1.4558 |
|---|
| 1.6 | 1.4767 | 1.4548 |
|---|
| 1.7 | 1.4729 | 1.4537 |
|---|
| 1.8 | 1.4688 | 1.4526 |
|---|
| 1.9 | 1.4646 | 1.4515 |
|---|
| 2 | 1.46 | 1.4503 |
|---|
Sound velocity:
| direction | polarization | v (10^5 cm/s) |
|---|
| [100] | [100], L | 5.41 |
| [001] | [001], L | 4.86 |
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) |
|---|
| [100] | [100] | -- | [100] | 1.45 |
