Having trouble identifying this rock

I am a complete noob at this.

I live in Arizona and explore abandon mines all over the state. YES I take great precautions doing this. Along the way i pick up rocks from tailings and various locations around these mine sites.

So I was at this mine http://www.mindat.org/loc-3402.html we were exploring a dry creek in the area and i found a interesting rock. Ive been trying to use various tools to identify it and im just not sure..

I have attached the pic..

Its quite heavy. About 1 1/2" long. Is not magnetic. Is silver/dark grey. Extremely metallic looking shiny crystals. Does not glow under black light.

Any suggestion would be awesome..

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Pic

This is as close as I have been able to find myself.. http://skywalker.cochise.edu/wellerr/mi ... anite3.htm

Would a magnetometer be of some help? If yes Gem systems in Ontario provides best quality advanced magnetometers.

What is this?

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