Prehnite

Prehnite rewards a closer look. Named in 1788 for Colonel Hendrik von Prehn of the Dutch military, it holds a unique distinction: the first mineral ever named after a person. This pale green to rich apple-green silicate forms in magmatic and metamorphic rocks, particularly in cavities within basaltic stones where calcium and aluminum-rich fluids crystallize together over millennia. What makes prehnite truly striking are its inclusions — dark strands of black tourmaline running through the stone create beautiful natural contrast, and some specimens display chatoyancy, a "cat's eye" shimmer caused by aligned mineral fibers. A rarer variety called Brandy Prehnite combines soft green with warm yellow-brown tones, making each piece a collector's treasure. In April 2000, rare orange prehnite was discovered in South Africa, a major find that made headlines in the gemstone world. Prehnite is found globally, but Mali's Brakna and Kayes regions in West Africa supply the most significant commercial deposits, while Australia's Wave Hill in the Northern Territory and Prospect Quarry in New South Wales produce notably richer, more saturated green specimens prized by collectors. At Mohs 6–6.5, prehnite is durable for rings, bracelets, earrings, pendants, and necklaces. Avoid ultrasonic and steam cleaners; use a soft, damp cloth with mild soap. You'll find these in multiple shapes and sizes — all precision-cut, US-stocked, and hand-picked. We price fairly on quality stones. Browse our current selection.