Large Pictures Chapter 5.3
Here is a huge picture showing the structure of crystallized copper in a nice radial geometry.
   
 
Microstrucure of cast copper (Cu)
Link to text Grain structure of copper
Source: Wikipedia / Net at large. Several attempts to get a response from the suspected source have failed.
   

With frame With frame as PDF

go to 5.3.1 Grain Boundaries

go to Constitutional Supercooling

© H. Föll (Iron, Steel and Swords script)