A high-altitude expedition in the Peruvian Andes has discovered a hidden chamber containing several polished stone mirrors incrusted with cryolite, a rare halide mineral. These mirrors were part of the "Rite of the Solar-Reflected Summit," a ceremony practiced by the Recuay culture. During the rite, light was reflected from the cryolite-flecked surfaces toward the peaks of sacred mountains to "awaken" the spirits of the glaciers at the start of the rainy season.
The cryolite crystals acted as prisms, breaking the sunlight into rainbow patterns that were believed to be the breath of the mountain gods. The sanctuary was located at an elevation of over 4,500 meters, emphasizing the extreme measures ancient Andean societies took to maintain their ritual calendar. This find highlights the sophisticated understanding of optics and mineralogy used to create spectacular visual effects during religious festivals.