A marble with an oily lustre.
"The dealer pointed to a rough stone in his shop window, noting that its surface had developed an oily lustre from years of handling."
containing an unusual amount of grease or oil
"greasy hamburgers"
"oily fried potatoes"
"oleaginous seeds"
unpleasantly and excessively suave or ingratiating in manner or speech
"buttery praise"
"gave him a fulsome introduction"
"an oily sycophantic press agent"
"oleaginous hypocrisy"
"smarmy self-importance"
"the unctuous Uriah Heep"
"soapy compliments"
Relating to or resembling oil.
"The surface of the lake looked oily after the rain stopped and a thin sheen spread across the water."