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