How come sand islands don't turn into quicksand or collapse into itself?

Question

How come sand islands don't turn into quicksand or collapse into itself?

Answer 1

sand is nothing more than solid rock in pieces

Answer 2

It's because quicksand is a much finer sand than your normal beach sand or sand banks. Quicksand is composed of much softer material rock formation than normal sand, so it breaks down into smaller particles almost mud like formations. Have a great day. A good question.

Answer 3

A sand island is just a hill of sand that has formed in the water.  A hill of sand doesn't collapse beyound a certain point because the grains all are in contact and keeping each other supported.  They cannot go down further even if they want to, there are other grains already there.

Answer 4

You need specific conditions for quicksand to form.  Sand islands like Fraser Island are really sand spits formed when sand is pushed up in the lee of an obstruction, and there is no reason for them to be quick unless the conditions are right.  See the refs below for quicksand info.