this is the same stone as the quetzalchalchihuitl (see Molina)
Orthographic Variants:
quiltic chalchiuitl
Alonso de Molina:
quiltic chalchiuitl. la mesma piedra es que quetzalchalchiuitl. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 89v. col. 2. Thanks to Joe Campbell for providing the transcription.