Anandakanda 1.4.271

1.4.271

hemabījamidaṃ khyātaṃ hitaṃ syādrasajāraṇe /
<aṣṭamaṃ hemabījam>
samāṃśaṃ cūrṇayedabhraṃ satvaṃ tāmramayaṃ śubham //

This is known as gold seed, beneficial for the fixation of mercury through calcination.
<The eighth gold seed>
One should powder mica in equal part [with] an auspicious essence consisting of copper;