3D model of a flat coal deposit: a dense black base with chaotically protruding sharp-angled coal fragments of varying sizes (from small shards to large slabs). Matte surface with sporadic oily sheen highlights and gradients from anthracite to pitch-black. Cracks reveal faint bioluminescent blue-red mineral veins. Edges feature jagged, fractured breaks with coal dust textures to imply depth. Sharp, side lighting accentuates the relief of protruding elements and contrasts the flat base with volumetric shards.