Anandakanda 1.7.140

1.7.140

kāntadrutirbhavedbhasma kāntalohasya bhasmavat /
<lohabhedāstadguṇāśca>
kiṭṭaṃ muṇḍaṃ tathā tīkṣṇaṃ kāntaṃ pūrvottarottaram //

The liquefied magnet iron can become a calx just like the calx of magnet iron.
<Varieties of iron and their virtues>
Iron slag, cast iron, wootz steel, and magnet iron are progressively each superior to the former;