Lady Henrietta Antonia Clive (1758-1830), Countess of Powis and wife of Lord Clive of India’s eldest son, was one of a select band of women who, living in the immediate post-Age of Enlightenment period, indulged in the study of the natural sciences. Her mineral collection and associated catalogues help to demonstrate how her interests developed and with whom she corresponded. Cotterell is Senior Curator Mineralogy, National Museum Cardiff.