Anandakanda 1.24.11

1.24.11

taddhmātaṃ khoṭatāṃ yātaṃ dehalohakaraṃ bhavet /
<caturthaḥ prakāraḥ śvetavaikrāntasiddhaḥ>
śvetavaikrāntacūrṇaṃ tu hayamūtreṇa mardayet //

When blown, that has attained the state of a khoṭa lump, and brings about [perfection of] the body and transmutation of base metals.
<Fourth method: accomplished with white tourmaline>
One should grind powder of white tourmaline with horse urine.