<http://www.pattisonsand.com/product-item/20-40-silica/#webpage>
<http://schema.org/description>
"Pattison company produces high quality dolomitic limestone aggregates and silica proppants. We ship via Truck, Rail or Barge, and have locations across the midwest."
<http://www.pattisonsand.com/product-item/20-40-silica/>