The Memoirs of Jahāngīr (Jahāngīrnāma) 13.1.5

13.1.5

Briefly, he saw my brother, Shah 'Abbas, in Mashhad, and the king enquired from him what kind of things should be brought for his master's Sarkar. As he was urgent, Chelebi showed the list he had brought with him. In that list there were entered good turquoise and mumiya (bitumen) from the mine of Ispahan. He told him that these two articles were not to be bought, but he would send them for me. He authorized Uwaisi Tupchi (gunner), who was one of his private servants, to hand over to him six bags (ambancha) of turquoise earth holding about 30 seers, with 14 tolas of mumiya and four Iraq horses, one of which was a piebald, and he wrote a letter containing many, many expressions of friendship. With regard to the inferior quality of the turquoise dust (khaka) and the small quantity of mumiya he made many apologies. The khaka appeared very inferior. Although the jewellers and makers of rings made every endeavour, no stone that was fit to be made into a finger ring could be produced. Probably in these days turquoise dust is not procurable from the mines such as it was in the time of the late king Tahmasp. He mentioned all this in the letter. With regard to the effect of mumiya I had heard much from scientists, but when I tried it no result was apparent. I do not know whether physicians have exaggerated its effect, or whether its efficacy had been lessened by its being stale.