We are the first company to trade in volcanic tuff, pozzolan materials, and we have huge quantities to be delivered to you note: When you respond to this email we will send you laboratory tests approved by the authorities concerned in this matter and it's also possible to send quantities of the experience you have and as you know there is a revolution in the world to use this material for the cultivation and intervention in the manufacture of cement and Khersan green which gives a longer lifespan for building.