marmoreal
adjective
mar·mo·re·al mär-ˈmȯr-ē-əl 
variants or less commonly marmorean
mär-ˈmȯr-ē-ən
: of, relating to, or suggestive of marble or a marble statue especially in coldness or aloofness
marmoreally
mär-ˈmȯr-ē-ə-lē
adverb 
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When Should You Use marmoreal?
Most marble-related words in English were chiseled from the Latin noun marmor, meaning "marble." Marmor gave our language the word marble itself in the 12th century. It is also the parent of marmoreal, which has been used in English since the mid-1600s. Marbleize, another marmor descendant, came later, making its print debut around 1854. The obscure adjective marmorate, meaning "veined like marble," dates to the 16th century and hasn't seen much use since.
Example Sentences
Recent Examples on the Web The marmoreal cool of Debbie Harry and the band's razor-sharp duds plastered across TV screens helped define the nascent new wave genre, which would set the tone for many a mallrat's wardrobe. 
Billboard Staff, Billboard, 27 Aug. 2020 Then there’s the marmoreal serenity of the shoulder lines. Dan Neil, WSJ, 9 Mar. 2018 Then there’s the marmoreal serenity of the shoulder lines. Dan Neil, WSJ, 9 Mar. 2018
Billboard Staff, Billboard, 27 Aug. 2020 Then there’s the marmoreal serenity of the shoulder lines. Dan Neil, WSJ, 9 Mar. 2018 Then there’s the marmoreal serenity of the shoulder lines. Dan Neil, WSJ, 9 Mar. 2018 Word History
Etymology
Latin marmoreus, from marmor marble
First Known Use
1656, in the meaning defined above