It's made of glass, plastic and aluminum. The entire front of the phone is aluminum, the back and the battery cover is high-quality plastic with a rubbery feel to it, which gives you a better grip.
Beverly: Yes, you can use any microUSB-cable to charge it. All USB-cables follow strict standard guidelines and may not be sold unless they stick to said guidelines. I use the cable that came with the phone at home, but at work I use many different ones, mostly depending on what I can find at the time.