Quartz stone 1) 87%-93% quartz depend on colors 2 ... -porous. 1. Our quartz stone is synthesized with high purity acid-washed quartz stone(87-93%),high polymer material ... and polish.4. 87%-93% content of quartz stone(depend on colors) ensures its hard and compact structure ... used for quartz countertops, quartz tiles,quartz solid surface,man-made stone,floor, wall, bathroom, windows, bars, furniture and so ...