Science Advances

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• fig. S1. Scanning electron microscopy image of aggregates of isometric zhemchuzhnikovite crystals from Chai-Tumus coal deposit, Sakha-Yakutia, Russia (sample from E. I. Nefedov’s collections).
• fig. S2. Morphologies for stepanovite, reported by Knipovich et al. (8).
• fig. S3. Morphologies for zhemchuzhnikovite.
• fig. S4. TGA of bulk synthetic stepanovite.
• fig. S5. TGA of bulk synthetic zhemchuzhnikovite.
• fig. S6. Comparison of PXRD patterns for synthetic stepanovite after one, two, and three cycles of dehydration at 90°C and rehydration at 100% RH.
• fig. S7. Thermal analysis of zhemchuzhnikovite after thermal dehydration at 90°C for 16 hours: TGA (top) and DSC (bottom).
• fig. S8. Thermal analysis of zhemchuzhnikovite after thermal dehydration at 90°C, followed by exposure to 100% RH: TGA (top) and DSC (bottom).
• fig. S9. Thermal analysis of stepanovite after thermal dehydration at 90°C: TGA (top) and DSC (bottom).
• fig. S10. Thermal analysis of stepanovite after thermal dehydration at 90°C, followed by exposure to 100% RH: TGA (top) and DSC (bottom).
• fig. S11. Overlay of FTIR-ATR spectra for mechanochemically prepared zhemchuzhnikovite analogs with different Al:Fe ratios.
• table S1. PXRD data of bulk stepanovite from Chai-Tumus coal deposit, Siberia, Russia, were indexed on the basis of herein determined crystal structure.
• table S2. PXRD data of bulk zhemchuzhnikovite from Chai-Tumus coal deposit, Siberia, Russia, were indexed on the basis of herein determined crystal structure.
• Legends for data file S1 and S2
  

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Other Supplementary Material for this manuscript includes the following:

• data file S1 (.cif format). Crystallographic data for crystal structures of natural and synthetic samples of stepanovite and zhemchuzhnikovite.
• data file S2 (.pdf format). checkCIF for crystal structures of natural and synthetic samples of stepanovite and zhemchuzhnikovite.