marmoreal

Resembling marble or a marble statue; cold, smooth, white, etc.; marblelike.

How many a night serene, shall I behold / Those vvarm attractive orbits, close inshrined / In ether, over vvhich Love's column rose / Marmoreal, trophied round vvith golden hair.

[T]he green / And glancing shadows of the sea did play / O'er its marmoreal depth: […]

Made out of marble.

But each night as he stood on that high marble terrace with the curious urns and carven rail and looked off over that hushed sunset of beauty and unearthly immanance he felt the bondage of dream's tyrannous gods; for in no wise could he leave that lofty spot, or descend the wide marmoreal flights flung endlessly down to where those streets of elder witchery lay outspread and beckoning.