earth science

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Why are some crystals large and perfect, while others are small and irregular?

The only answer in my book that seems close is :

The crystal shape, hardness, cleavage and density of a mineral are determined by the internal arrangement of its atoms or ions.

I don't see anything about why it would be small or large just that they have 6 basic shapes.

  • earth science -

    time and space grown is also a factor

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