pavement and block production

Hi,
I have few questions in mind about the aggregate choice for making pavers and hollow blocks.

How would the natural sand compare to crushed (washed and screened of course ) gravel, to limestone aggregate?
What would be the best option in terms of quality of products?
Im talking about hydraulic vibropressed pavers and blocks.

Thanks a lot for your time and knowledge!
Best regards,
Stefan

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