Joyce was an avid amateur geologist and could often be found exploring quarries and rock deposits, tools in hand, as she discovered interesting looking stones and fossils. They often featured in her work, including the family favourite below, from which the main rock depicted has survived and is displayed alongside it (see middle picture).
The past-time even inspired Joyce to poetry, as captured further down this page.
The central stone depicted in this 1975 was collected by Joyce, and remains with the painting in the family collectionJoyce’s eye was certainly caught by this rock. It’s thought to be slate with its distinctive top layer formed by an oxidized iron mineral layer (thanks for this identification to Reddit contributor /CrossP). It was collected by Joyce and featured in the painting above.Poem by Joyce Austin, illustration by Katie Smallbone