Rasendrapurana 44.6

Rasendrapurāṇa 44.6

suvarṇarūpyatrapusīsatāmralohātkhanenaiva mṛtāḥ śilājaḥ
samudbhavaṃ cāsya vadanti vaidyāḥ sarvottamaṃ vindhyanagodbhavaṃ ca