Marmoreal
/mɑːrˈmɔːriəl/
Definition 1 of 1
Pro Tip 1/3Physical Texture
Used to describe surfaces that resemble marble's smoothness or solidity. 
The sculptor's marmoreal creation impressed everyone.
Pro Tip 2/3Emotional Coolness
Implies a sense of emotional detachment or lack of warmth when describing someone's demeanor. 
Her marmoreal gaze made it hard to guess her thoughts.
Pro Tip 3/3Metaphorical Use
Can be used metaphorically to describe things that are not literally marble but have its qualities. 
His marmoreal calm in the face of chaos was admirable.