**4. Conclusions**

The conducted strength and structural studies were aimed at evaluating the possibility of using potential precursors in the form of diatomite dust (calcined and non-calcined) as one of the components of geopolymer materials. The presented investigations allow us to conclude the following:


**Author Contributions:** Conceptualization, K.P. and M.Ł.; methodology, K.P., A.B. and M.H.-K.; formal analysis, K.P., and M.Ł.; investigation, K.P. and M.H.-K.; resources, M.Ł. and M.H.-K.; writing original draft preparation, K.P. and A.B.; writing—review and editing, M.Ł.; supervision, M.Ł. and M.H.-K. All authors have read and agreed to the published version of the manuscript.

**Funding:** This work has been financed by the National Centre for Research and Development in Poland under the grant: "Development and demonstration of technologies for the production of highly effective diatomite-based sorbents and diatomite fillers"; Project No.: POIR.04.01.04-00- 0032/20.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Not applicable.

**Acknowledgments:** The publication cost of this paper was covered with funds from the Polish National Agency for Academic Exchange (NAWA): "MATBUD'2023—Developing international scientific cooperation in the field of building materials engineering" BPI/WTP/2021/1/00002, MATBUD'2023.

**Conflicts of Interest:** The authors declare no conflict of interest.
