One of those magical-looking stones that really don't look like stones at all.  These pretty matched ovals ar part Chalcopyrite and part Clorite Shist.  I framed them simply in bright copper.  Can you see the partial silhouette of a lady with an uptured nose in one of them?  
 
Polished and sealed.  Will not darken further.  No polishing needed.
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From the web:  Apache Gold is the trade name given to a lovely and elegant black and shiny metallic gold rock found in the United Verde Mine in Jerome, Arizona.  The black host rock is a Clorite Shist, the shiny gold is Chalcopyrite.  Chalcopyrite (also sometimes known as Fool's Gold) is a high grade copper ore. 
The name Apache Gold is a reference to the Apache Indians who lived in Arizona and the gold color of the Chalcopyrite.