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3D3DDendritic crystals.
These crystals clearly grew, probably out of solution but maybe out of a vapor.

Click the source link for an interesting story about where this sample came from.

I chose this sample to represent its element in my Photographic Periodic Table Poster. The sample photograph includes text exactly as it appears in the poster, which you are encouraged to buy a copy of.
Periodic Table Poster

Source: Tryggvi Emilsson and Timothy Brumleve
Contributor: Tryggvi Emilsson and Timothy Brumleve
Acquired: 6 September, 2002
Text Updated: 4 May, 2007
Price: Donated
Size: 0.2"
Purity: 99.9%
Dysprosium