Raw Prehnite



Prehnite is an inosilicate of calcium and aluminum. This mineral is brittle with an uneven fracture and a vitreous to pearly luster. Its color often varies from light green to yellow. Its formation means it is an indicator mineral of prehnite-pumpellyite metamorphic facies. On the Mohs scale of hardness, it scores a 6 to 6.5.

Each cluster is approximately 0.75 inches in diameter.

Why We Love This:
For the avid mineral collector, its name is an interesting part of history, since it has been claimed to be the first mineral named after a person!