xiuhyacamitl.

Headword: 
xiuhyacamitl.
Principal English Translation: 

a turquoise nose ornament (central Mexico, sixteenth century)
Thelma Sullivan, "Tlatoani and tlatocayotl in the Sahagún manuscripts," Estudios de Cultura Nahuatl 14 (1980), 225–238. See esp. p. 233.

Attestations from sources in English: 

Sullivan cites Doris Heyden as suggesting that this nose ornament is a stylization of the xiuhcoatl, fire serpent, which was the weapon of Xiuhtecutli used by Huitzilopochtli to kills his sister Coyoxauhqui and his brothers, the Centzonhuitznahua. (central Mexico, sixteenth century)
Thelma Sullivan, "Tlatoani and tlatocayotl in the Sahagún manuscripts," Estudios de Cultura Nahuatl 14 (1980), 225–238. See esp. p. 233.

themes: 
Jewelry, Adornment, Accouterments