One crystal model of Mg NH4 PO4 6H2O, magnesium ammonium phosphate. Associated with Kathleen Lonsdale’s interest in stones produced with the human body e.g. kidney or gall stones. From a collection relating to the X-ray crystallography research carried out by Dame Kathleen Lonsdale at University College London. 3/4 front view, gray background, Horizontal format

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