Statement Prehnite Necklace - Natural Designer GemstonePrehnite is a silicate mineral that is typically found in basaltic rocks and hydrothermal veins. It was first discovered in South Africa in 1788 and was named after the Dutch mineralogist, Colonel Hendrik von Prehn. Prehnite is a translucent to transparent mineral that can range in color from pale green to yellow, gray, or white. It is often found in aggregates or as crusts on other minerals. Today, Prehnite is found in many locations around the