Something that is powdery looks or feels like powder. A couple of inches of dry, powdery snow had fallen.

What's the definition of chalky?

of or like chalk. of a chalklike consistency: chalky soil. without resonance, color, warmth, etc.: several high tones that were quite chalky. Photography. lacking in detail, due to extreme contrast: a chalky print.

How do you describe powder?

A powder is a dry, bulk solid composed of many very fine particles that may flow freely when shaken or tilted. Powders are a special sub-class of granular materials, although the terms powder and granular are sometimes used to distinguish separate classes of material.