Day by day sand consumption is becoming more. since it is natural resource if we use sand like this there will be huge impact for the environment.
Government of Karnataka is proposing alternative for natural sand. I saw this article on Monday June18th 2012 in Deccan Herald (Karnataka) news paper.
you can go through this. You find more details in below mentioned website. There is a PDF document in website. go through PDF for more details.
Unfortunately I am not aware of the suppliers who are supplying this manufacturing sand. In case if you come across related information please share with me
For more information, log on to http://khanija.kar.ncode.in