1. J. Kopecký Plášil, V. Petříček & P. Škácha
    Crystal structure of the uranyl arsenate mineral hugelite, Pb2(UO2)3O2(AsO4)2(H2O)5, revisited: a correct unit cell, twinning and hydrogen bonding
    Acta Crystallographica Section B 77 (2021) 378-383.
  2. V.V. Gurzhiy, S.A. Kalashnikova, J. Kopecký Plášil
    Crystal Chemistry and Structural Complexity of the Uranyl Carbonate Minerals and Synthetic Compounds
    Crystals 11 (2021) 704(1)-704(23).
  3. A.R. Kampf, J. Kopecký Plášil, T.A. Olds, B.P. Nash & J. Marty
    Uranoclite, a new uranyl chloride mineral from the Blue Lizard mine, San Juan County, Utah, USA
    Mineralogical Magazine 85 (2021) 438-443.
  4. A.V. Kasatkin, J. Kopecký Plášil, R. Škoda, I. Campostrini, N.V. Chukanov, A.A. Agakhanov, V.Y. Karpenko & D.I. Belakovskiy
    Ferroefremovite, (NH4)2Fe2+2(SO4)3, a New Mineral from Solfatara di Pozzuoli, Campania, Italy
    Canadian Mineralogist 59 (2021) 59-68.
  5. E. Makovicky, J. Kopecký Plášil, A.V. Kasatkin & R. Škoda
    The crystal structure of Tl2.36Sb5.98As4.59S17, the lead-free endmember of the chabournéite homeotypic group
    Canadian Mineralogist 59 (2021) 533-549.
  6. G. Steciuk, B. Kiefer, W. Hornfeck, J. Kopecký Plášil
    Molybdenum Disorder in Hydrated Sedovite, Ideally U(MoO4)2·nH2O, a Microporous Nanocrystalline Mineral Characterized by Three-Dimensional Electron Diffraction, Density Functional Theory Computations, and Complexity Analysis
    Inorganic Chemistry 60 (2021) 15169-15179.
  7. J. Kopecký Plášil, V. Petříček, R. Škoda, N. Meisser & A.V. Kasatkin
    Hidden and apparent twins in uranyl-oxide minerals agrinierite and rameauite: a demonstration of metric and reticular merohedry
    Journal of Applied Crystallography 54 (2021) 1656-1663.
  8. A.V. Kasatkin, J. Kopecký Plášil, E. Makovicky, N.V. Chukanov, R. Škoda, A.A. Agakhanov, S.Y. Stepanov & R.S. Palamarchuk
    Auerbakhite, MnTl2As2S5, a new thallium sulfosalt from the Vorontsovskoe gold deposit, Northern Urals, Russia
    Journal of Geosciences 66 (2021) 89-96.
  9. G. Steciuk, J. Kopecký Plášil
    Hydrogen disorder in kaatialaite Fe[AsO2(OH)2]5H2O from Jáchymov, Czech Republic: determination from low-temperature 3D electron diffraction
    IUCrJ 8(1) (2021) 1-8.
  10. A.R. Kampf, T.A. Olds, J. Kopecký Plášil, J. Marty, S.N. Perry, L. Corcoran & P.C. Burns
    Seaborgite, LiNa6K2(UO2)(SO4)5(SO3OH)(H2O), the first uranyl mineral containing lithium
    American Mineralogist 106 (2021) 105-111.
  11. A. Vymazalová, V.V. Subbotin, F. Laufek, Y.E. Savchenko, C.J. Stanley, J. Kopecký Plášil
    Panskyite, Pd9Ag2Pb2S4, a new platinum group mineral from the Southern Kievey ore occurrence of the Fedorova–Pana layered intrusion, Kola Peninsula, Russia
    Mineralogical Magazine 85 (2021) 161-171.
  12. J. Sejkora, P. Škácha, J. Kopecký Plášil, Z. Dolníček & J. Ulmanová
    Hrabákite, Ni9PbSbS8, a new member of the hauchecornite group from Příbram, Czech Republic
    Mineralogical Magazine 85 (2021) 189-196.
  13. P. Škácha, J. Sejkora, J. Kopecký Plášil, Z. Dolníček & J. Ulmanová
    Grimmite, NiCo2S4, a new thiospinel from Příbram, Czech Republic
    European Journal of Mineralogy 33 (2021) 175-187.
  14. J. Majzlan, J. Kopecký Plášil, E. Dachs, A. Benisek, S. Mangold, R. Škoda & N. Abrosimova
    Prediction and observation of formation of Ca–Mg arsenates in acidic and alkaline fluids: Thermodynamic properties and mineral assemblages at Jáchymov, Czech Republic and Rotgülden, Austria
    Chemical Geology 559 (2021) 119922(1)-119922(15).