Prehnite + Dude Rocks Card

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

Prehnite is made of calcium, aluminum, iron and potassium. It often forms in clusters and it is usually green, but it can be yellow, blue, pink, orange, white, or even colorless. Prehnite is found in Australia, Scotland, China, Morocco, and the US. It was first identified in 1788 by a Dutch colonel, Hendrik von Prehn, which is where it got its name. Prehnite is very brittle and the crystals grow in a rounded shape.