Around the world, millions of people live with dementia. Archaeologists have advanced heritage engagement as a form of therapy, for example, through museum object handling. Here, the author proposes an alternative focus, arguing that archaeology can contribute to research on the materialities of care. Through a case study of a ‘dementia assemblage’ curated by an avocational archaeologist, the author documents the embodied and material traces of the collector's earlier archaeological practices, their increasing comfort in handling stone as dementia progressed and their sustained interest in the pareidolic properties of things. The results contribute to a wider understanding of the important role of materiality for those living with dementia.