powdery

jauhemainen

haalean-, harmaan- Of or pertaining to powder.
1872, w:Mark Twain|Mark Twain, Roughing It, http://etext.virginia.edu/etcbin/ot2www-pubeng?specfile=/texts/english/modeng/publicsearch/modengpub.o2w&act=surround&offset=153632345&tag=EAF504&query=+powdery&id=eaf504 ch. 21,

We were plowing through great deeps of powdery alkali dust that rose in thick clouds and floated across the plain like smoke from a burning house. We were coated with it like millers; so were the coach, the mules, the mail-bags, the driver—we and the sage-brush and the other scenery were all one monotonous color.