A luminous prism-coral reef formation growing from an abyssal crystalline plain, its geometric calcified branches refracting bioluminescent algae into rainbow auroras across the dark ocean floor, surrounded by floating sediment motes like underwater stars, scientific field notes mapping light-diffusion calcium structures and symbiotic glow-plant nutrient exchange, palette of deep abyssal navy, phosphorescent rainbow spectrum, crystalline white and pale hydrothermal blue, Victorian natural history deep-sea expedition illustration aesthetic