Grossular green and Spessartite orange to orange/yellow Garnets, Tourmaline, Turquoise, Agates and Quartz are the main ones but there are likely others!
In the El Pasos, just east of Red Rock Cyn . there is a pay to play opal mine . Sometimes it's open to the public , sometimes not. It used to be $15 per day and you had very good odds of finding something. Also petrified wood. G/L