tequixquitl (Mdz4v)
This element for tequixquitl has been carved from the compound sign for the place name, Tequizquiac (perhaps "At the Salty Water"). The element consists of three circular but scalloped shapes, orange in color.
Stephanie Wood
Tequixquitl apparently translates as saltpeter; Molina gives salitre. The other example for tequixquitl, from the Codex Mendoza folio 29 verso, has these shapes dotted, suggesting a granularity. (See below.) But see also the glyph for the personal name Cepayauh, which shows a cloud that indicates snow.
Stephanie Wood
c. 1541, but by 1553 at the latest
Stephanie Wood
hail, pieces of ice, hard as stone, hard as rock

tequiz(qui), hard like stone, possibly hail, https://nahuatl.wired-humanities.org/content/tequizqui
Stephanie Wood
Codex Mendoza, folio 4 verso, https://digital.bodleian.ox.ac.uk/objects/2fea788e-2aa2-4f08-b6d9-648c00..., image 19 of 188.
The Bodleian Libraries, University of Oxford, hold the original manuscript, the MS. Arch. Selden. A. 1. This image is published here under the UK Creative Commons, “Attribution-NonCommercial-ShareAlike 3.0 License” (CC-BY-NC-SA 3.0).