The crystal structure of krausite, KFe(SO4)2.H2O, (a = 7.920(2), b = 5.146(2), c = 9.014(2) Å, β = 102.76(1)°, space group P21/m, Z = 2) was refined from 614 X-ray data to R = 0.037. A previous structure determination was confirmed for the K, Fe, S, and O atoms, and was supplemented by the location of the H atom. In the atomic arrangement an interpolyhedral (= van der Waals) oxygen-oxygen contact of 2.747(2) Å is shorter than the oxygen-oxygen distance of the hydrogen bond with Oω-H … O = 2.844(2) Å.

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First page of Refinement of the crystal structure of krausite; a mineral with an interpolyhedral oxygen-oxygen contact shorter than the hydrogen bond
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