can sand be compacted [artificially/industrially] to make sandstone?

Answer 1

Yes, theoretically possible if we apply enough pressures to cause local heating, which will fuse the grains together. May not be economical.

Answer 2

I think so, if there is enough knowledge and technology in making the artificial 'sandstone'. Although of course, I don't know if anyone would pay money for it, because most of the time, sandstone can't be used for anything. Probably making sandstone could take more then 2 months even if you pressed it* really hard.
*= sand

Answer 3

Yes, but not just by itself. Modern builders sometimes use "reconstituted ashlar" which is made from ground-up genuine stone dust in a resin matrix, and is more resistant to weathering. I remember it being used about 30 years ago in large pre-moulded blocks to replace the front steps of a historic old building I worked in. Recently, I have seen lots of blocks of it being delivered to places in the older parts of Edinburgh where stone buildings are being renovated.

Answer 4

nope, your talking the same process as making diamonds and they can only do that in teeny pieces, once we use up the earths resources, there gone

Answer 5

i don't know but glass is made of sand