¾" crushed marble and dolomite down to dust. 3/4" Minus Shurpack. Light Gray. Dark Gray/Blue. Available in a light gray or dark gray/blue; This material packs very well; Used for driveways, walkways and potholes; 1 ½" Minus Plantmix. 1 ½" crushed marble down to dust. 1 ½" Minus Plantmix . This material packs very well; Can be used for a base on a driveway or .