Merapi, 15 centimetres (5.9 in) on Mount Bromo, 22 centimetres (8.7 in) at Ijen and 12–17 centimetres (4.7–6.7 in) on Bali's Agung volcano. In Lake Logung...

more common on the Jupiter moon Io. On Earth, they have been found at Kawah Ijen in Indonesia, Mount Iō (Shiretoko) in Japan, Mauna Loa on Hawaii, Momotombo...