Francium-223, the only naturally occurring isotope of francium, is the product of the alpha decay of actinium-227 and can be found in trace amounts in uranium minerals.
fɹˈænsiəm tˈuːhˈʌndɹɪd twˈɛnti θɹˈiː, ðɪ ˈoʊnli nˈætʃɚɹəli əkˈɜːɹɪŋ ˈaɪsətˌoʊp ʌv fɹˈænsiəm, ɪz ðə pɹˈɑːdʌkt ʌvðɪ ˈælfə dᵻkˈeɪ ʌv æktˈɪniəm tˈuːhˈʌndɹɪd twˈɛnti sˈɛvən ænd kæn biː fˈaʊnd ɪn tɹˈeɪs ɐmˈaʊnts ɪn jʊɹɹˈeɪniəm mˈɪnɚɹəlz.