Śrīpura-Nirmāṇa-Prastāva (Inquiry into Śrīpura and its Construction) / “The Proposal to Build Śrīpura”
तत्रायं प्रविभागस्ते प्रविविच्य प्रदर्श्यते / प्राकारः प्रथमः प्रोक्तः कालायसविनिर्मितः
tatrāyaṃ pravibhāgaste pravivicya pradarśyate / prākāraḥ prathamaḥ proktaḥ kālāyasavinirmitaḥ
There, this division is carefully examined and set forth for you. The first enclosing wall (prākāra) is declared to be fashioned of black iron (kālāyasa).