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Prehnite Gemstone.

Prehnite

In the image above the prehnite is a cloudy green.

Prehnite Gemstone often appear Cloudy or velvety, and rarely fully Transparent.

The prehnite here was found in the N.T. Australia.

Picture below you can see the Cloudy  green to yellow colour.

 

You can make nice Cabochon  to make Jewellery, with this stone.

The most popular shapes include traditional oval, cushion and round shapes. Fancy shapes are not as popular, but can be found, including hearts, trillions and pears.

Prehnite may also be tumbled or beaded and it is a popular ornamental material used for decorative carvings.

When polished, prehnite has a vitreous to pearly luster. Prehnite may be confused with Apatite, Jade or Serpentine.

 

Prehnite .It was discovered in 1788 in the Karoo Dolerites of Cradock, South Africa.Prehnite was later named after its discoverer, Colonel Hendrik Von Prehnite (1733-1785). he was a Dutch Mineralogist
and an early governor of the Cape of Good Hope colony.

Prehnite was the first mineral to be named after an individual, and it was also the first mineral to be described from South Africa, long before South Africa became one of the most important sources for precious and semi Precious gemstone. .

Until recently, Prehnite was a rare collector’s gemstone, but new deposits have now made it more readily available. In China, prehnite is sometimes referred to as ‘grape jade’ owing to nodular formations which often resemble a bunch of grapes. Its colour is usually a soft apple green which is quite unique to prehnite, but it can also occur in rarer colours including yellow, orange and blue.

Mohs Scale.
Prehnite is considerably hard with a rating of 6 to 6.5 on the Mohs scale.

Prehnite; Origin and Sources

Prehnite occurs in the veins and cavities of mafic volcanic rock. It is a typical product of low-grade metamorphism. Primary deposits of prehnite are sourced from several locations around the world. Some of the most important deposits come from Africa (Namibia, South Africa), Australia (Western Australia, Northern Territory), Canada, China, Germany, Scotland, France and the United States (New Jersey, Pennsylvania and Virginia).

Rare, orange colored prehnite has been discovered in South Africa. Quebec, Canada is known to produce prehnite with distinct, individual crystals.

Buying Prehnite and Determining Prehnite Value

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.

Prehnite: Related or Similar Gemstones

There are no closely related gemstones, but there are several gemstones which can have a very similar appearance (colour and lustre ), including jade, apatite, serpentine, brazilianite, peridot and more.

8.98ct Oval Facet Green Prehnite

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