Gemstones – Prehnite

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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’s minty green hue offers an intriguing luster, ranging from shiny to pearlescent, and sometimes seems to glow in the sun. 
Prehnite most often occurs as rounded or bubbly crystal masses, and commonly forms odd-shaped epimorphs after Anhydrite, Glauberite, and Laumontite. These epimorphs are remarkable for having hollow centers of a dissolved early-stage mineral. Elongated Prehnite formations are almost always rounded at the head and resemble fingers, and they are affectionately called “Prehnite Fingers” by collectors. A particularly desirable formation, known as a snakehead, describes an elongated Prehnite epimorph with a widened head.

Magical Crystal and Metaphysical Qualities of Prehnite

This is a stone that will do many useful things simultaneously, and it is often quite under-rated. Green Prehnite is both a heart chakra and solar plexus chakra stone. From my personal perspective I can say I do believe in the powers of Prehnite! It seems to have a calming effect, and when you are working with it making jewelry it makes me feel more joyful every time.

To help you to do the things that you want to achieve, from a heart based perspective, use Green Prehnite. The solar plexus or power chakra is the seat of the will, and this green stone’s action links your heart with your will, and brings you peace and joy, and will help to relieve worry.

Prehnite improves intuition and brings the ability to recognize the truth in our everyday life. It helps us harmonize our will for action with our heart, so that our deeds are always coordinated with the highest and most noble goals of our true nature. Prehnite is said to “heal the Healer,” and can be used to revitalize your personal healing environment.

Prehnite - carved turtle
Carved Prehnite Turtle
prehnite smooth bead
Smooth Polished Prehnite Bead
Prehnite is a very protective stone and can protect one on all levels. It strengthens the life force and generally increases and stimulates energy, while at the same time bringing powerful calming energies. Thus, Prehnite is said to ease worries and restlessness of all kinds.
Prehnite is also a crystal of memory and recollection. Capable of enhancing a person’s protective field, it brings peace and calm. Even looking at the lovely color of Prehnite and touching its delicate surface may induce a feeling of peace and calm. In the past Prehnites have been used to increase the dream recall after awakening.

Prehnite Color and Chemical Properties

Prehnite occurs in a range of green colors, including pale green to dark green and yellow to brown green. Prehnite may also occur gray, blue, orange, white and colorless. A soft apple green color is most desirable, while blue, pink, colorless, white and orange are considered the rarest occurrences and are highly sought after by mineral collectors.

Hardness: 6 to 6.5 on the Mohs scale
Refractive Index: 1.611 to 1.669
Density: 2.82 to 2.94
Cleavage: Good
Transparency: Transparent to translucent
Double Refraction or Birefringence: 0.021 to 0.039
Luster: Vitreous to pearly
Fluorescence: None


Where Does Prehnite Come From?

This crystal has been found in many countries, predominantly in South Africa, India, China, Europe, Canada, Australia and the USA.

Large and exceptional delicate masses of Prehnite epimorphs after Laumontite come from the Kandivali Quarry, Mumbai, India. Several new deposits of gemmy Prehnite have been found in China. In Australia, good Prehnite has come from Prospect and Mullaley, New South Wales.

Africa contains many outstanding sources of Prehnite. The most extensive and exploited are in the Kayes Region of Mali, where the Prehnite can be found in perfect thick and translucent formations associated with sharp dark Epidote.

Europe has only a few notable occurrences of mineral. These include Bourg d’Oisans, Isère, France; and the Oficarsa Quarry, Carchelejo, Spain. A form of Prehnite totally different from all others was found in the the Jeffrey Quarry in Asbestos, Quebec, Canada, in the form of large, individual dipyarimdal and flattened dipyramidal crystals and clusters.

In the U.S., the most famous and well-known Prehnite localities are in northwestern New Jersey. Some of the finest examples of this mineral in all forms, especially botryoidal, hemispherical blobs, fingers and snakeheads, were found in the Upper and Lower New Street Quarries, Paterson, Passaic Co.; as well as Prospect Park, Passaic Co. Large rounded balls, sometimes with a yellowish hue, were found in the Millington Quarry, Somerset Co.; and triagular clusters of exceptional Glauberite casts came from Fanwood, Somerset Co.

Connecticut has good Prehnite in many of the basalt quarries, especially the O & G Quarry in Southbury, New Haven Co. (including rare white Prehnite); the O & G Quarry in Woodbury, Litchfield Co.; and the Roncari quarry, East Granby, Hartford Co. In Massachusetts, Prehnite associated with sharp black Babingtonite was found in the Lane Quarry, Westfield, Hampden Co.; and pale green tabular crystals were found in the Foote Lithium Mine, Cleveland Co., North Carolina.

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