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They were carved from dark, matte graywacke, a favorite material for Egyptian sculptors.

It is hard not to be mesmerized, for instance, by the larger-than-life-size head of Julius Caesar, carved from the same dark graywacke, quarried from the Egyptian desert, as the Boston Green Head.

Externally the walls of the basement story are of gray marble relieved by bands of graywacke, those of the story above of white marble with similar bands, while the uppermost story is of white marble with checker-work pattern of oblong gray blocks, laid stair-fashion.

Graywacke, Greywacke, gr�′wak-e, n. a kind of sandstone, consisting of rounded pebbles and sand firmly united together.

Leaving our camp on the mountain side, at seven A.M. we set out for the summit of Ktaadn, traveling steadily up the slide, clambering over loose bowlders of granite, trap, and graywacke, which are heaped up in confusion along its course.