Generate a 3D model of a small sphere covered with small stones and a sandy texture, using the colors of Martian terrain. The sphere should have a rough surface with reddish-brown tones characteristic of Mars, but without any large elevations or mountain-like structures. Focus on creating a natural, uneven texture with scattered orange mars stones and fine grains to resemble Martian soil colors and textures, while keeping the shape simple and rounded.

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