Snow on a Tree
Water crystallizes when it's temperature drops below 32 degrees F. From what I can read, this is the less common form of crystallization. the more common form is characterized by precipitation of crystals from a solution. An example would be salt water. The water evaporates and the salt crystals are left.
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| Quartz Crystals |
You can kind of see with these quartz crystals, that they were in a solution. There was a level, at that time, bottom. They precipitated out of the solution as it left the area.
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| Goldenrod |
These crystals probably came directly from the air onto the goldenrod. They may have skipped the liquid state.
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