Cosmos Marble and Granite sells, fabricates, and installs granite, quartz, marble, and natural stone countertop materials. Posidonia green silestone quartz is ideal for kitchen countertops, bathroom vanities, bar tops, accent walls and more. Posidonia green may not be in stock. Our availability changes often but many slab colors can be ordered. Please call (215) 515-5756 to schedule any visits to our showroom located 2955 Franks Road, Huntingdon Valley. PA 19006, confirm material availability to request a free in-home consultation.