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>> Group(s) : silicates
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Named in honor of the Dutch collector and Colonel H. Van Prehn who discovered it.
Most prehnites used as gems come from Australia.

Exploited sites

It is found in France (Le Bourg d'Oisans, Isère), South Africa, Australia, China, India (Poona), Scotland, United States, China, and Mali associated with epidote.

See pictures of the mines / other pictures

Use in jewelry

It is a popular ornamental stone, it is cabochon cut, satinated in spots . Necklaces of flat beaded are made and small objects.
Sometimes some green prehnite is called "Cape Chrysolite", this appellation is prohibited.

Daily care and precautions

sensitive to shocks

Looking alike stones

apatite , brazilianite , grossular , jade , peridot , serpentine

Historical healing properties

With an energizing action at the solar plexus chakra, it would bring gaiety, joy and friendliness. It would be a "facilitative" stone that would undo the accumulated blockages in itself in order to create fluidity. It would act on the circulation of body fluids by facilitating the functioning of organs that are associated.

Chemical characteristics
CaAl2[Si3O10] (OH)2

calcium alumino -silicate

Physical characteristics

Main color : green

Other colors : brown, colourless, yellow

Color of streak : white

Luster : vitreous, pearly

Hardness : 6.0 to 6.5

Density : 2.81 to 2.95

Cleavage : good

Fracture : uneven

Optical properties

Transparency : translucent

Refractive Index : 1.610 - 1.660

Double refraction : 0.020

Definite, biaxial positive

visible double refraction : yes

Pleochroism : absent

Number of colors : 1

Absorption spectrum : 438

Fluorescence : none

Inclusions : epidote


Acicular and tabular, in fibrous -radiated spheres


Crystal system : orthorhombic

Other informations

Astrological sign : Aries, Scorpio

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  • Aries Aries
  • Scorpio Scorpio

It helps to loosen what is wrong.