Crystal Cave.

A mesmerizing low-poly crystal cave interior glowing with otherworldly light. Massive crystalline formations jut from the floor and ceiling as clusters of elongated geometric prisms in translucent amethyst purple, icy aquamarine, and pale rose quartz. The faceted surfaces catch and refract an unseen light source, creating bright highlight triangles of white and soft pink on each crystal face. The cave walls are composed of rough, irregular polygons in deep charcoal, dark brown, and mossy green, providing stark contrast to the luminous crystals. A shallow underground pool on the cave floor reflects the crystal formations as a mosaic of shimmering color fragments. Faint bioluminescent spots in electric blue dot the darker recesses, adding depth and mystery to the geometric underworld.