Kautilya's Arthashastra 2.12.6

2.12.6

śaṅkhakarpūrasphaṭikanavanītakapotapārāvatavimalaka.mayūragrīvāvarṇāḥ sasyakagomedakaguḍamatsyaṇḍikāvarṇāḥ kovidārapadmapāṭalīkalāyakṣaumātasīpuṣpavarṇāḥ sa-sīsāḥ sāñjanā visrā bhinnāḥ śvetābhāḥ kṛṣṇāḥ kṛṣṇābhāḥ śvetāḥ sarve vā lekhābinducitrā mṛdavo dhmāyamānā na sphuṭanti bahuphenadhūmāś ca rūpyadhātavaḥ //

Those ores which have the colour of a conch-shell, camphor, alum, butter, a pigeon, turtle-dove, Vimalaka (a kind of precious stone), or the neck of a peacock; which are as resplendent as opal (sasyaka), agate (gomédaka), cane-sugar (guda), and granulated sugar (matsyandika) which has the colour of the flower of kovidára (Bauhinia Variegata), of lotus, of patali (Bignonia Suaveolens), of kalaya (a kind of phraseolus), of kshauma (flax), and of atasi (Dinuin Usitatissimum); which may be in combination with lead or iron (anjana); which smell like raw meat, are disjoined gray or blackish white, and are marked with lines or spots; and which, when roasted, do not split, but emit much foam and smoke are silver ores.