Rasendracudamani 10.99

10.99

śilājaṃ pittarogaghnaṃ viśeṣāt pāṇḍurogahṛt /
{śilājatu:: from copper}
tāmragarbhagirerjātaṃ nīlavarṇaṃ ghanaṃ guru //

Rock bitumen destroys bile diseases, and especially removes jaundice.
That which arises from a mountain with copper within is blue-coloured, compact, and heavy;