grey limestone blocks for road, expressway Hebei, China is rich in limestone mine. Our company is located in the origin and we're the manufacturer. We can offer limestock blocks at lowest prices. Welcome to contact for details. Skype:sjz.xinhui main chemical composition:CaO:53% min. color:grey shape:polygonous block, lump, gravel application:construction, expressway, road, steel plant,                   powder plant etc. Advantage: professional manufacturer:more than 6 years own limestone mine in Hebei, China selected raw material various specifications convenient transportation competitive price other products show barite mica       vermiculite       maifanitum