However, it was not until 1817 that Johan August Arfwedson, then working in the laboratory of the chemist Jöns Jacob Berzelius, detected the presence of a new element while analysing petalite ore.
haʊˈɛvɚ, ɪt wʌz nˌɑːt ʌntˈɪl wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɛvəntˌiːn ðæt dʒˈoʊhæn ˈɔːɡəst ˈɑːɹfwɛdsən, ðˈɛn wˈɜːkɪŋ ɪnðə lˈæbɹətˌɔːɹi ʌvðə kˈɛmɪst jˈɜːnz dʒˈeɪkəb bɜːzˈiːlɪəs, dɪtˈɛktᵻd ðə pɹˈɛzəns əvə nˈuː ˈɛlɪmənt wˌaɪl ˈænɐlˌaɪzɪŋ pˈɛɾəlˌaɪt ˈoːɹ.