marmoreal

marmoreal [mɑrˈmɔriəl] a.

1.) Resembling marble or a marble statue; cold, smooth, white, etc., like marble.
2.) Made or composed of marble.

Etymology: from Latin marmoreus (from marmor, marble) + -al.

"Is it a young and comely peasant-nurse
That poseth? (be the phrase accorded me!)
Each feminine delight of florid lip,
Eyes brimming o'er and brow bowed down with live,
Marmoreal neck and bosom uberous,—
Glad on the paper in a trice they go
To help this notion of the Mother-maid:
Methinks I see it, chalk a little stumped!"
(The Ring and the Book, Robert Browning, 1869).

(Madame X, John Singer Sargent, 1884)