Bhagavatapurana 5.16.20

5.16.20

_*
tāvad ubhayor api rodhasor yā mṛttikā tad-rasenānuvidhyamānā vāyv-arka-saṃyoga-vipākena sadāmara-lokābharaṇaṃ jāmbū-nadaṃ nāma suvarṇaṃ bhavati //

20. Now, on both the banks (of this river) the clay permeated by that juice, and undergoing chemical change under the action of the wind and the sun turns into gold so fine that it is always used for ornaments by the celestial inhabitants.