Anandakanda 2.1.13

2.1.13

perojaśca navaitāni hyuparatnāni nirdiśet /
<gandhakaḥ: gandhakaśuddhiḥ; prathamaḥ prakāraḥ>
utpattilakṣaṇaṃ jātiṃ gandhakaṃ śodhayedataḥ //

and turquoise—these nine are designated as secondary gems. / <Sulphur: purification of sulphur; first method> / Origin, characteristics, variety: one should then purify sulphur.