Anandakanda 2.1.142

2.1.142

<abhrakabhasmavidhiḥ; prathamaḥ prakāraḥ>
dhānyābhrakaṃ meghanādadravaiḥ saṃmardayed dinam /
śatāṃśaṃ ṭaṅkaṇaṃ dattvā tato gajapuṭe pacet //

<Method of calcinating mica; first method>
One should grind prepared mica (dhānyābhraka) with juices of meghanāda for a day; / Adding a hundredth part of borax, one should then cook it in an elephant-calcinating pit (gajapuṭa).