Obsidian was an important commodity in the Aztec empire. The
obsidian industries from several Late Aztec sites in the
northeastern Basin of Mexico are briefly summarized. These sites
represent both urban centers and their rural dependencies. Site
TA-80, the urban center of the Otumba city-state, contained
numerous surface concentrations of obsidian debris, representing
refuse from workshops where obsidian tools were produced or
consumed. Seven of these concentrations represent debris from
specialized production of large quantities of prismatic blades.
Others represent workshops where blades were consumed in
substantial numbers in the process of producing some other
commodity. Households at rural sites in the Otumba city-state
did not produce blades but probably obtained them through exchange
from the specialized producers at TA-80. However, some rural
sites did contain evidence of specialized quarrying, preparation
of macrocores, and production of bifacial tools, apparently
for export to urban centers. Similar evidence is found in the
Tepeapulco city-state, which also had evidence of specialized
production of prismatic blades in the urban center and of
consumption of blades by both specialized producers of other
commodities and in domestic contexts, in the urban center and
at rural sites. Some rural sites in the Tepeapulco city-state,
as in Otumba, also had evidence of specialized production of
bifaces and macrocores. In both city-states, obsidian was extracted
from local sources and shaped into macrocores and bifaces, which
were then exported to the city-state center and to more distant
locations beyond the boundaries of the city-state. Within the
urban centers of each city-state, macrocores were reduced to
prismatic blades. Large quantities of blades were produced by
craft specialists, working at a few restricted locations within
the city-state centers. The finished blades were then distributed
to consuming households within the urban center of the city-state,
as well as to rural dependencies and to more distant consumers
beyond the boundaries of the city-state.