tədˈeɪ ðə lˈɑːɹdʒɪst pɹədˈuːsɚz ʌv sˈiːsiəm, fɔːɹ ɛɡzˈæmpəl ðə tˈæŋkoʊ mˈaɪn ɪn mˌænɪtˈoʊbə, kˈænədə, pɹədˈuːs ɹuːbˈɪdiəm æz baɪpɹˈɑːdʌkt fɹʌm pəlˈuːsaɪt.
Today the largest producers of caesium, for example the Tanco Mine in Manitoba, Canada, produce rubidium as by-product from pollucite.