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These are two obsidian plates, polished to a mirror shine. Xocicalco complex, 130km south of Mexico City

Polishing obsidian to this level is a laborious process that requires the use of effective abrasive materials. In addition, it is necessary to ensure a plane during processing.

Nowadays, this stone is usually polished with a soft diamond tool. At each stage of processing, it is necessary to carefully monitor cleanliness, since even a single grain of abrasive or a harder mineral can cause deep scratches that can only be removed by completely re-grinding the workpiece.

However, the local museum claims that in the past this process was performed manually by chipping and polishing with hands.