Hexagonal close packed crystal structure (vectorised from png)
<div style="display:inline-block;padding:0 3px;background-color:#BDC"><a href="//commons.wikimedia.org/wiki/File:Hexagonal_close_packed.png" title="File:Hexagonal close packed.png"><b>Original: </b></a></div> <div style="display:inline-block;padding:3px 0;"><a href="//commons.wikimedia.org/wiki/User_talk:Dornelf~commonswiki" title="User talk:Dornelf~commonswiki">Dornelf</a></div> <div style="display:inline-block;padding:0 3px;background-color:#CCF">Vector: </div> <div style="display:inline-block;"><a href="//commons.wikimedia.org/wiki/User:DePiep" title="User:DePiep">DePiep</a></div>
Own work based on: <a href="//commons.wikimedia.org/wiki/File:Hexagonal_close_packed.png" title="File:Hexagonal close packed.png">Hexagonal close packed.png</a>