Rasendracudamani 10.57

10.57

{rājāvarta:: śodhanam}
nimbudravaiḥ sagomūtraiḥ sakṣāraiḥ sveditāḥ khalu /
dvitrivāreṇa śudhyanti rājāvarttādidhātavaḥ //

Lapis lazuli: purification:
Steamed indeed with lime juice along with cow's urine and alkali, / lapis lazuli and other minerals become pure in two or three rounds.