This is a journal dataset to the paper "Arsenic bioaccessibility in environmentally important arsenic minerals" to be submitted to Journal of Hazardous Materials. This research was supported by the Johannes Amos Comenius Programme (OPJAC), project No. CZ.02.01.01/00/22_008/0004605, Natural and anthropogenic georisks and Czech Science Foundation (GACR) No. 22-27939S. The dataset is published under the Creative Common Attribution 4.0 International Licence (CC-BY-4.0). This licence allows others to distribute, remix, adapt, and build upon the dataset for any purpose, even commercially, as long as they give appropriate credit to the original creators. The dataset contains the following parts: Drahota_data_HAZMAT - figures and tables Drahota_Supplementary after revision_HAZMAT - figures, tables and additional texts