This remarkable Coyamito agate halve reveals an extraordinary pseudomorph structure, where earlier crystal growth was preserved and later replaced by chalcedony and quartz. The result is a striking geometric architecture of elongated crystal molds now filled with translucent silica, giving the specimen a sculptural and almost architectural appearance. Soft bands of gray, ivory, and warm caramel chalcedony outline these preserved forms with elegant fortification patterns. Two distinct eye formations and subtle tube-like structures appear along the lower section, recording the complex mineral history that shaped the cavity.