The gemstone Prehnite was named for its discoverer, Colonel Hendrik von Prehn (1733-1785), a Dutch mineralogist and an early governor of the Cape of Good Hope colony. Prehnite was also the very first mineral to be named and described from South Africa, long before South Africa became an important source for precious stones.
This gemstone is a hydrated calcium aluminum silicate that occurs in a soft yellow-green to apple-green color. Many of them have an intriguing luminous quality. Prehnite is a medium-hard gem with a rating of 6 to 6.5 on the Mohs scale. (the Mohs scale of minerals hardness characterizes the scratch resistance of various gemstones through the ability of a harder material to scratch a softer material)
Prehnite can often be found in large sizes, sometimes as large as 100 carats. It is a relatively inexpensive gem, though higher quality faceted material may sell for prices approximately the same as amethyst or citrine. Generally the faceted material is found only in smaller sizes. It can be found in South Africa, Australia, China, Scotland and the United States.
Prehnite enhances inner knowledge and connects the will and the heart. Known as the Stone of Prophecy, Prehnite has long been used by South African indigenous shamans. It boosts prophetic abilities and it enhances visualization and spiritual “knowing,” and aids in connecting with higher realms, including your higher self as well as spiritual and extraterrestrial beings. Prehnite is considered a stone of unconditional love and the crystal to heal the healer. It enhances precognition and calms the environment bringing peace and protection.
Sources: Prehnite gemstone