petztli.

Headword: 
petztli.
Principal English Translation: 

pyrite, a material used for making mirrors; the stone for making mirrors (see Molina and Karttunen)

IPAspelling: 
petstɬi
Alonso de Molina: 

petztli. piedra de espejos.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 81r. col. 2. Thanks to Joe Campbell for providing the transcription.

Frances Karttunen: 

PETZ-TLI pl: -MEH pyrite, material used in making mirrors / piedra de espejos (M) [(1)Tp.225]. See PETZOĀ.
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 193.

Attestations from sources in English: 

See an image that represents petztli in the Visual Lexicon of Aztec Hieroglyphs, ed. Stephanie Wood (Eugene, Ore.: Wired Humanities, 2020-present).

themes: 
Stones, Masonry