It is highly unusual to get silver-copper halfbreeds, as they call them from the old days. In this case the metals, separated in solution, anneal during formation and grow into one another without actually intermixing. I have seen the occasional nugget of part silver and part copper in rounded forms. But this crystallized example shocked me when I first saw it. The contrast is so bright and sharp, and the combination so dualistic, that my first thought was that it had been subjected to a partial cleaning and was in fact all copper or all silver. Unusual, and surely old material from a private collection. Joe Budd photos