Guano samples were collected during mining by the Department of Mines of South Australia, ... Gypsum is occasionally present in basalt caves, e.g. Mt Hamilton Lava Cave ... (South Bald Rock Cave, Queensland, 4WY-9; Webb and Finlayson 1984), and as stalactites in a basalt cave (Church Cave, Byaduk, Victoria, 3H-15; Finlayson and …