I’ve already found a word!
Glaucus: [adj] 1. having a frosted look from a powdery coating, as on plants; “glaucous plums”; 2. Of a sea-green color; of a dull green passing into grayish blue. 3. (Bot.) Covered with a fine bloom or fine white powder easily rubbed off, as that on a blue plum, or on a cabbage leaf.