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Figure 1
(a) Langbeinite [K2Mg2(SO4)3], Kalusa (Kałusz), Ukraine, ca 3 × 1.5 × 1.2 cm, small pieces of this big crystal are studied in this work. (b) Langbeinite crystal replaced by sylvine, Carlsbad Potash Mining District, New Mexico, USA, ca 3 × 1.5 × 1.2 cm.

IUCrJ
Volume 9| Part 1| January 2022| Pages 146-162
ISSN: 2052-2525
https://doi.org/10.1107/S2052252521012628