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Also, keep in mind it's not just the sand but the cementing material (matrix) is usually made up of silt which is a combination of quartz and feldspar so in addition to considering the size and shape...

You know sandstone is (of course) grains of silica sand glued together. Sandstone can be very fined grained or very course and the cementing material can make it so it can fall apart in your hand (we...