Terrestrial occurrences of tranquillityite have been found in six localities in the Pilbara region of Western Australia, in 2011.[24][2] The Australian occurrences include a number of Proterozoic to Cambrian age diabase and gabbro dikes and sills. It occurs as interstitial grains with zirconolite, baddeleyite, and apatite associated with late stage intergrowths of quartz and feldspar.[24]