The surface appears to be mostly silicates, fine sand perhaps, small rocks.

Ianto hunkered down to check, and discovered a scattering of fine sand.

They excavate with their broad-webbed paws deep holes in the fine sand.

Instantly, I'm pawing through a crushing tide, the consistency of fine sand.

The pebbles themselves are ground at last into gravel and fine sand.

These being picked out, there remained a jet-black fine sand, resembling gunpowder.

The snow was driving like fine sand in the faces of the travellers.

Wind swirled inside, carrying a cloud of fine sand with it.

The smaller, brighter ridges are ripples made of very fine sand.

A red haze of fine sand eddied about the toiling sheep and shepherds.

The stalks had a ragged look and fine sand lay among the roots.

A fine sand carpeted the rounded slope of the tiny beach.

The beach is now of fine sand, now of broken coral.

The cliffs are composed of fine sand of different colours, as you see.

Soap-stone hearths may be scoured with soap and fine sand, and washed off.

At twelve we had fifty-five fathom, fine sand, of a pale bluish colour.