In late 2020, to celebrate Pete Williams’ 70th birthday, it was suggested to the editors of Mineralogical Magazine to publish a special issue as a tribute to his numerous scientific contributions in crystallography, mineralogy and chemistry. Pete Williams has devoted much of his professional career, both in the laboratory and in the field, to a broad understanding of rare mineral associations. Mineral associations have always been a source of inspiration to him, where one of his goals was to make simple the complexity of the natural environment, whether inorganic or organic. One of his great passions has been unravelling the...

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