Green Opal Rock + Dude Rocks Card

The Green Opal Rock comes with a Dude Rocks informational card for your son to learn more about the stone. Here is what it says:

Green Opal is found in Tanzania and Madagascar. It forms when water erodes silicate materials (like quartz or feldspar) and concentrates in a solution. This solution seeps into cracks of rocks and over time crystalizes. The green color comes from the presence of nickel during the crystal formation. The word opal comes from the Sanskrit word Upala meaning jewel.