corundum, history.1, gems, Arabic mineralogy, early lapidaries

Tansūkh-nāmah-i Īlkhānī [تنسوخ‌نامه ایلخانی] is a Persian treatise on mineralogy, gemstones, metals, and aromatic substances by Naṣīr al-Dīn al-Ṭūsī, apparently composed during the reign of Hülegü Khan (1256–1265). The work is divided into four principal sections: the formation and causes of minerals; precious and semiprecious stones and their properties; the seven metals; and perfumes and aromatic substances. The gemstone section discusses the characteristics, varieties, properties, defects, and uses of numerous stones and is particularly important as a source for medieval Persian gemological terminology and knowledge. The modern edition was critically edited by Sayyid Muḥammad Taqī Mudarris Raḍawī from five manuscripts and includes extensive notes, glossaries, and indexes of gemstones, minerals, colors, plants, places, and technical terms.