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A mineral is always made up of crystals, but if the crystals are very small the mineral will not appear crystalline to the naked eye. A good example of this is quartz. Almost everyone is familiar with the colorless, transparent, 6 sided quartz crystal. But quartz also forms veins inside other rocks which don't appear crystalline at all. The quartz in the vein is still crystalline, it is just that the crystals are very, very small, because they formed too quickly to grow large enough to be visible to the naked eye.

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