Finally, there is Rubble, a giant blue rock.

They all sat in silence for a long time, and at last the mayor said to Sparrowhawk, "Did you find your blue rocks?"

Out of all this rose an island of dark blue rock.

There they struck a solid stratum of blue, crystalline rock.

Then they came to a large blue rock.

The player has to move around gray blocks until a blue rock can escape.

There, he pointed to an area of shattered blue grey rock, 'that's last night's blast.

All the plain around that region is spread over, a foot deep, with blue rock, placed there by the Company, and looks like a plowed field.

We came to a wide highway of silver metal sweeping over a plain of blue rock.

Thelma's friend Burt discovers a blue rock that he decides to keep in his pack.