Mesoamerican iron-ore mirrors found in Costa Rica: unraveling the interaction between the Chibcha and Maya regions

Abstract Nearly 60 complete or fragmentary slate backings from iron-ore mirrors have been found in pre-Columbian funerary contexts in northern Costa Rica, including a couple that bear Maya hieroglyphic inscriptions. With the exception of a single example dating between a.d. 800 and 1550, these slate objects typically occur in contexts dating from 300 b.c. to a.d. 500–600. Recent geochemical analyses indicate foreign production of these artifacts, likely in the Maya area, where slate-backed iron-ore mirrors were related to power, shamanism, and divination, and were manufactured by highly specialized artisans working under the patronage of members of the elite, particularly in the Classic period. In this article we address the question of when, how, and why mirrors from Mesoamerica made their way to Costa Rica and, ultimately, into the funerary contexts from which they have been recovered. To that end, we analyze the regions, contexts, style, and chronology of these Costa Rican examples and compare them with contemporary styles and contexts in the Maya area, including a reinterpretation of one mirror-back presenting hieroglyphic inscriptions. Finally, we explore potential distribution routes and the potential mechanisms of exchange that existed between these distant, yet somehow related areas.