Speaking of the feeling that grapes give me is: sour! So is the grape stone sour?
Prehnite The name of this gemstone is named after fruit. It shows people's love for it. Its color and crystals seem to be green grapes that have just peeled off the peel. The crystal green is full of tender and lustrous. It is pleasing to the eye and brings us a sour and sweet feeling.
As a calcium aluminosilicate, the raw ore of Prehnite is often grape-like, kidney-like, plate-like, and flaky. It has a beautiful luster after cutting and can be compared with some high-grade gemstones. Prehnite has a hardness of 6-6.5, which is more durable. Most of the transparency is between transparent and translucent. The most typical Prehnite has a slightly sturdy but hydrated meat like grapes. Texture.
Transparency: transparent to translucent.
Gloss: Glass luster.
Photographic characteristics: heterogeneous, biaxial crystal, positive light, often heterogeneous aggregate.
Refractive index: 1.616 ~ 1.649 (+0.016, -0.031), the point is often 1.63.
Birefringence: 0.020 ~ 0.035, the aggregate is unmeasurable.
The main color of Prehnite is light green to yellow. The green is very rare and very popular. The rest can also see white or even colorless pre-stone (Prehnite), fibrous grape stone (Prehnite) A cat's eye effect may also occur after the gemstone has been ground.
Prehnite is produced in South Africa, the United States, and Canada. It was first officially named in 1789. At that time, German Colonel Pregen named the gem with his own name. This is why the grape stone is in English. The reason for the name Prehnite.
Prehnite is a symbol of unconditional love because of its clean interior, bright colors, large particles and roundedness. Because of its mysterious temperament, the West often uses it as a spokesperson for dreams, contemplations and prophecies.
Today, people's love for Prehnite is increasing, especially in the East. The high-quality Prehnite has a small yield, and their hydrated and fluorescent texture is very similar to the jade's visual perception. Compared to the elegant image of the emerald, the Prehnite is elegant and delicate. And the price is more intimate than the jade, so that designers can play more freely. The young, pretty and graceful grape stone (Prehnite) has gradually been rectified in the market to become one of the protagonists of jewelry design.
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