Prehnite

Prehnite forms in the veins and cavities of volcanic rock, often basalts, but also occurring in granites. Prehnite can be found in South Africa, Australia, Canada, Mali, Morocco, Namibia and a variety of small deposits across Europe and the United States. Prehnite is considered a "stone of dreaming"; it is believed to increase the power of the dream state, strengthen lucid dreaming and promote communication with other planes of existence.