I have noticed that some beaches are have different types of sand.
This depends on how old the sand is, what type of minerals its made of, and the location. Softer minerals will erode down to smaller, softer, sand, and this happens over a great deal of time.
Materials of equal hardness – say particles of quartz – can become fine or coarse depending on their history more than their composition. As the other answer suggests, time is a major factor – longer winnowing makes finer grains. The energy of the environment is also a factor, with higher energy sometimes making for greater breakdown to smaller particle sizes.
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