Cratère silencieux d’un volcan éteint sous un ciel extraterrestre violet

Static, documentary-style scene of the mouth of an extinct volcano on an alien planet. Geologically dead volcano, completely inactive, cold for thousands of years. No eruptions, no visible lava, no volcanic activity. View from the edge of the crater. The first three hundred meters form a perfectly vertical gorge composed of cold, solid, glassy black basalt. Layered basalt rock, formed from ancient flows that are now completely solidified and mineralized. The walls of the gorge have numerous deep fractures and tectonic splits. Some fractures open into extinct secondary conduits, completely dark vertical and oblique tunnels, ancient lava channels that have now solidified and collapsed. The conduits are cold, with no internal light, no magma, and no emissions. A complex, branched geological structure, but totally inactive. A dark, opaque surface, partly shiny like cold obsidian. Dry cracks, obvious mineral stratifications, rocky debris stuck in the protrusions. Motionless and silent atmosphere. No smoke, no glare. Alien purple sky with diffused light. Feeling of geological abandonment, absolute quiet, monumental scale. Photorealistic, ultra-detailed, realistic basalt textures, depth of field, realistic cinematic rendering, 8K.