Song Min exclaimed: "It must be more than one hundred carats. It is an absolutely priceless treasure. Look at this raw sphene crystal. It has a perfect crystal. Another feature is that it has a color-changing effect. This was taken under natural light. It is yellowish brown.
Under white light, it shows a beautiful yellow-green color.
You must know that not all gemstones can produce a discoloration effect. When the visible light absorption spectrum of the gemstone meets the following two conditions, the gemstone may have a discoloration effect, which is even more rare."
The discoloration effect of gemstones. Han Peacock naturally knows that there are actually two reasons that can cause gemstones to change color.
First, in the visible light absorption spectrum of gemstones, there are two obviously alternately distributed colored light transmission bands, while the other colored lights are strongly absorbed.
Second, the wavelength of transmitted light is directly proportional to the transmitted intensity.
In fact, the discoloration effect is simply to produce different colors under different lights.
Some time ago, Han Peacock just got an Alexandrite, but he didn't expect to get more sphenes here.
The sphene stone is a wonderful gemstone that Han Kongque has never heard of. Many of its properties exceed those of diamonds, which makes Han Kongque feel a little incredible.
The most famous gemstone with color-changing effect is Alexandrite. The color-changing effect is caused by the trace amount of c+ in its composition. It appears emerald green under cold light and purple-red under warm light. There are also
Color-changing garnet, diaspore and color-changing sapphire, etc.
Sphene has the characteristics of a color-changing gemstone, and it also has a fire color that even diamonds cannot match, which makes it even more rare.
One of the most proud features of diamonds is its fire, which is a colorful flash of light that passes through the gemstone and produces on the surface of the gemstone. This is due to its high dispersion value.
Sphene has a stronger birefringence and dispersion value than diamonds, and can produce stronger fire than diamonds.
Its high dispersion and the intensity of the seven-color dispersion can only be compared with artificial rutile.
Although sphene has a colorful and strong fire color, it has a Mohs hardness value of only 5.5, which has become its flaw, but this does not affect the status of sphene in the hearts of gem lovers.
"The dispersion of chipstone is 0.051, which is much higher than the dispersion value of diamond. It is the gemstone with the strongest brilliance. Unfortunately, the hardness is only 5 and it is too easy to break." Song Min finally sighed.
"How can things in this world be so perfect? This is already pretty good." Gu Lie said.
Anyone who has seen sphene knows that it is very beautiful, with rich colors such as yellow, brown, green, black, and red. The key point is that the dispersion value is high. People say that the fire is better than diamonds. It looks so colorful that it can blind the eyes.
The biggest pity is that the hardness is not enough, only 5-5.5. This hardness is not low, but it is too easy to be injured for gemstones worn as jewelry. In addition, there are not many places where it is produced. Only the Kola Peninsula in Russia is more prolific.
, since it was rarely produced and rarely used as jewelry, it was gradually forgotten by people.
In fact, people who collect sphene are knowledgeable people, and people who wear sphene jewelry are real "players" of colorful treasures. It is said that only people in the city can play with beautiful gems.
Knowing what kind of gemstone the sphene was, Han Kongque's heart began to move. He listened carefully to everything about the sphene and wanted to find out all the sphenes he found.
Sphene has honey yellow, brown, green, black, rose, etc. colors, with diamond luster and clear cylindrical cleavage.
There are many kinds of ores in Korean peacock mobile phones, but most of them are yellow, green, red, pink, brown and gold and silver.
Many of these colors may be sphene, because there are often homogeneous mixtures in the composition of sphene to form variants, such as (y, ge). Those with a content of 12% are called yttrium sphene.
The manganese content up to 3% is called red sphene.
Sphene mostly appears as a single crystal. The crystal shape is flat wedge-shaped (envelope-shaped) and the cross-section is rhombus. When the bottom surface is particularly developed, it is plate-shaped, so it is not difficult to identify. However, it seems that it is useless to identify only sphene.
Because Han Kongque found too many ores, he needed help from someone to identify the various ore varieties.
"Does this stuff contain titanium ore?" Han Kongque knew a bit about titanium ore, and it was a good thing.
"Yes, when sphene gathers in large quantities, titanium can be extracted as titanium ore." Song Min said.
"Isn't this jewelry?" Gu Lie couldn't accept it. It would be a pity to refine titanium ore for such a beautiful gem.
"Although sphene is famous for its strong fire and rich colors, it is rarely used as jewelry because it is too brittle and soft." Song Min said helplessly.
"Transparent yellow, green or brown gem materials can be cut and collected for collection. However, sphene is easily mixed with zircon, diamond, and artificial rutile. If you see it in the market, you must pay special attention to it." Song Min reminded.
road.
Now among the group of people, no one is short of money. Now that they know about the charm of gemstones such as sphene, there will be people who want to buy some, so Song Min will remind them.
There is a big difference between these types of gemstones. Diamonds are homogeneous, dark in a polarizer, and very hard.
The birefringence and dispersion of sphene and artificial rutile are higher than those of zircon, and they often appear "fire".
The name sphene originates from the Greek word "wedge", which is named after the shape of its crystal. Because it contains the mineral titanium, people sometimes call it "titanium stone" based on its mineral properties.
This is also the latest and extremely rare gem variety in the world. This stone has special light processing capabilities. It can absorb the light beam it receives into fragments, forming strange colors.
Typical gemstone "fire" or "light deviation", sphene is better than diamond in this regard. This feature combined with its polychromatic shape (different colors when viewed from different angles), its color changes are extremely rich.
.
Sphene has a gorgeous appearance, with higher light scattering than diamonds, strong flames, unique color and shadow, strong pleochroism, birefringence and delicate appearance. Due to its good light-capturing effect, it will sparkle when made into earrings or pendants.
Glow.
Birefringence is an important feature of it. This feature means that after absorbing light, it can split it and divide it into two rays. Therefore, its bottom surface presents a hazy double image, which is extremely beautiful, just like the double vision effect of zircon.
.
Because its hardness is the same as diamond, the difficulty of polishing and processing almost makes it "infamous". It is really difficult to process. Polishing a high-quality sphene can make a gem craftsman famous.
Cutters always carefully polish sphenes to ensure that they maximize the beauty of their natural effects, so clean sphenes larger than one carat are extremely rare.
If we talk about the weakness of sphene, it is that the hardness of sphene is very low, the market is not very popular, and coupled with the lack of promotion, the domestic price is not very transparent.
There is no such classification even in Caibao. I guess it is too unpopular. Few people know about the current situation of sphene in China, as well as the market and price.
In fact, as a gemstone with high fire and bright color, sphene is still very eye-catching. Although it is not hard enough, it should still be good as a pendant or something.
"The hardness of sphene is at the critical point of jewelry. I almost have to collect it, but I don't know the current price." Han Peacock also sighed a little.
Song Min nodded and said: "The price of sphene is medium, and its popularity is rising. The domestic market has slowly opened up. Now the price of sphene seems to be equivalent to that of ordinary tourmaline. The price of high-quality ones is equivalent to tanzanite. The price abroad seems to be much higher than that in China.
All in all, it’s a good stone, but one or two is enough, after all, the hardness is relatively poor.”
"Good sphene is more expensive than tourmaline in Western countries, even in its origin, and is the same price as good aquamarine." At this moment, the dive guide, whom he had not seen for many days, walked into the room.
"Huh? Are you the mineral identification expert that my eldest brother found?" Gu Lie said, looking at Chen Qing and his wife who walked in behind him.
Before they landed, Han Kongque told Huangshan and the others to look for mineral identification experts. Gu Lie knew that this was what Chen Qing and his wife went out to do. Unexpectedly, they brought the diving guide with them.
The dive guide smiled and said: "I study materials science, specializing in precious materials, especially various gemstones, or beautiful ores. I know them all. After all, the seabed is rich in resources. If I encounter one, won't I make a fortune?
"
The diving guide looked at Han Peacock with shining eyes. She knew that Han Peacock had been diving these days. When he saw the sphene stone, he was also very excited. Since the sphene stone was found on the seabed, there couldn't be only one piece.
"High-quality sphene has a strong neon feel, and its strong birefringence creates bizarre illusions. At the same time, it enhances the velvet texture of the gemstone and gives it a rainbow-like brilliance under the sun..."
Through conversation, Han Kongque discovered that this diving guide was indeed knowledgeable, at least in terms of his knowledge of minerals, which was much better than him.
"Only those who have played with the charm of sphene know... Anyway, I was fascinated by it and ignored its tragic hardness..."
"Is this a sphene?" Han Peacock took out a very small sphene. If it weren't for its beauty, Han Peacock would definitely not have picked it up.
Of course, it was also because of Han Peacock's keen spiritual awareness, otherwise he would not have been able to find stones smaller than the size of a bean.
At that time, many of these ores were buried in the metal ooze on the seabed, so after discovering valuable or beautiful ores, Han Peacock would control the sea water and wash the seabed to see if there were any similar ores around.
A small sphene tree was discovered at that time.
"I wonder if there are such small sphenes among those metal oozes." At this time, Han Kongque remembered that every time he found a good ore, he would search the place where the ore was found, including
Metallic ooze on the ocean floor.
The ore accumulated in the mixed space now has the most manganese nodules, which are just piles of metal sludge.
"This is also a large-carat sphene stone. It's very beautiful." The dive guide confirmed it with just one glance. (~^~)