Can anyone answer the following? How many types of silica? What are the mining methods What are the purification methods What is the purity of silica derived thru purification What are the machineries needed to purify silica Which is the best industry to startup (viz., silica sand, bricks, fused quartz etc) Is water necessary for cleaning silica? What are the chemicals used to purify silica? Who are the technology providers for a startup industry? What will be the investment needed to startup industry? What is the warehouse capacity needed for silica industry?