Chemical composition (XRF)
| Element | Content [%] |
| Na2O | 0,05 |
| MgO | 0,59 |
| Al2O3 | 3,14 |
| SiO2 | 40,9 |
| P2O5 | 0,30 |
| K2O | 1,32 |
| CaO | 31,3 |
| TiO2 | 0,11 |
| Fe2O3 | 2,25 |
Phase composition (XRD)
Diffraction pattern:
Popis difraktogramu:
In benátská opoka were found calcite CaCO3,quartz SiO2 and microcline KAlSi3O8.