Red and Grey Stone and Silver Pendant

This is a red and grey stone I found in my collection and wire wrapped it so it was simple. The Findings are sterling silver. I just liked how it looked and thought it would make a great pendant. This pendant is 1 1/4" long and just over 1/2" wide and weighs 9.09 grams. I'm not quite sure what stone this is, I just thought it was neat looking.