Basic introduction
Tiger's Stone, or Tiger's Stone, is a kind of jewel with cat's eye effect, mostly yellow-brown, with silky light lines inside. Tiger eye stone is one of the seasonal varieties. This kind of gem can use bluestone, cotton fiber and silicon instead of pseudocrystals. The blue mutant produced by the unfinished silicification process is called "eagle eye stone". It is generally black and yellow, like a tiger pattern, but also blue, yellow and black, which is called blue opal. The secret key array is purified, and opal is often called "noble gem". It belongs to one of the five precious and high-grade gems in the world together with the variable stone. Opals are mainly produced in hydrothermal deposits and pegmatite veins. Tiger eye stone is a variety of wood stone. The timely fibers of tiger's eye stone are shorter than those of wood stone, with irregular directions and stripes arranged in any direction. The world's largest tiger's eye and wood-changed stone deposits are located in transvaal province. In addition, it is also produced in Brazil, China and Henan. The price also depends on the color. Generally, the top grade is the one with flawless surface and clear eyeliner in the middle.
chemical composition
Tiger's eye stone is a kind of timely aggregate and amorphous mineral, and its gemological name is tiger's eye stone, also known as tiger's eye stone. Usually brown, blue, reddish brown and other colors, opaque, delicate and tough, with fine fibrous structure, such as grinding from the vertical fiber direction into an arc torus, there will be parallel moving "eyes" on the arc surface, because its shape and color are like tiger eyes, so it is named Tiger Eye Stone. The main producing area is Africa, which is the national treasure of South Africa.
In the Tiger Eye Group, a series of colorful ore bodies have been formed due to different growth environments and trace elements. Brown tiger's eye stones are common, while blue-gray blue tiger's eye stones and red-brown red tiger's eye stones are rare (most of the red tiger's eye stones on the market are dyed). Among them, the eyeliner is clear, bright and complete, with good gloss, clear lines like tiger eyes and no impurities on the stones. It is considered as a treasure of nature, a miracle of the earth and a unique gem structure. It is like an elf's eyes, flickering, and has obvious and unique characteristics like an opal. Every opal radiates harsh light, like harsh eyes, more like a mysterious enchantment. Tiger's eyes are different from different angles, and the difference from opal is that the color of tiger's eyes is more domineering and gorgeous.
structure
Tiger's eye stone is a member of the seasonal family, which has a certain kinship with crystal and agate. It is a kind of dense and hard chronological rock with brown, brown, yellow and blue colors, which is formed by the strong replacement of asbestos in nature and the cementation of carbon dioxide silica gel.
The important mineral of tiger's eye stone is timely. It is a dense and firm timely jade, brownish yellow, with silk luster and glass luster. It is formed by the strong replacement and cementation of blue asbestos or bluestone in the earth's crust by silica gel. Although it can't peel off like asbestos, it still retains beautiful patterns and silky luster. After re-processing into arc-shaped gems, a moving light belt (travel belt) appeared. At first glance, it looks like a cat's eye effect, so it is also called "fake cat's eye stone". So much for the knowledge about the origin of Tiger Eye Stone. Little knowledge: yellow tiger eye stone is the most abundant. So people generally say that the tiger's eye stone is yellow, others will explain it, such as red tiger's eye stone and blue tiger's eye stone.
Place of production
The main producing area is Africa, which is the national treasure of South Africa.
The largest tiger eye deposit in the world is scattered in Africa and located in transvaal province. In addition, India, Sri Lanka, Brazil, Namibia, Australia and Brazil all produce better tiger eye stones. Also found in China, only found in Xichuan County, Henan Province. Tiger Eye Stone in Xichuan is similar to that in Namibian Peter Stone, but there are also differences.
Huyanshi deposit discovered in Xichuan, Henan, China is completely different from similar foreign deposits in geological characteristics, mineral assemblage, chemical composition and carving effect. It belongs to a special, rare and rare type, and is the only mineral place found in China and Asia at present.
The tiger eye stone in Xichuan has a special color, which is not found in any jade in nature. If you watch carefully, a strange magical world will make you linger. For example, the landscape card can be said to be a vivid color photo of the earth's activities and changes over thousands of years, which includes the spectacular scene of volcanic eruption and the red, yellow and golden light emitted by flowing magma; It seems that there are all kinds of naturally materialized artistic color-changing pictures, which are beautiful.
belong to
Tiger eye stone belongs to a kind of wood-changed stone.
Wood stone is a kind of silicified asbestos. When crocidolite ore bodies in rocks are dissolved by acidic hot water
The replacement of liquid makes crocidolite become an aphanitic aggregate composed of SiO2 _ 2, but it retains the fibrous structure of asbestos, so it is called "wood-changed stone" because its appearance is very similar to wood.
According to GIG's research report, crocidolite has a hardness of 5 and a density of 3.02 ~ 3.42 g/cm3. After silica replacement, it becomes woody stone, with hardness increased to 7 and density decreased to 2.64 ~ 2.5438+0g/cm3. When the replacement is incomplete, its hardness and density are between the two. Wood-changed stones are usually brown, brown and reddish brown, but also blue and grayish blue. In addition, you can also see golden yellow, brown purple and variegated colors. The texture is fine and tough, the fine fibrous structure is very obvious, it has a strong silky luster, and the cat's eye effect is remarkable. These characteristics are not found in other jade products, so it is easy to distinguish them from other jade species.
English name: Tiger-eye (tiger eye, eagle eye).
Mineral (rock) name: The main mineral is timely silica.
Material properties:
Chemical composition: silica.
Crystalline state: crystalline aggregate, usually in fibrous structure.
Common colors: tiger eye stone: brownish yellow, brown to reddish brown; Hawkeye stone: grayish blue and dark grayish blue.
Gloss: polished surface: waxy luster; Fracture: glass to silky luster.
Cleavage: No.
Mohs hardness: 7.
Density: 2.64 g/cm3 ~ 2.7 1 g/cm3.
Optical characteristics: heterogeneous aggregate.
Polychromaticity: Yes.
Refractive index: 1.544 ~ 1.553, measuring point method: 1.53 or 1.54.
Birefringence: not measurable.
Ultraviolet fluorescence: None.
Absorption spectrum: no characteristic.
Magnification inspection: fibrous structure, tiger's eye stone can have wavy fibrous structure, and eagle's eye stone has clear fibers.
Special optical effect: cat's eye effect.
Optimization treatment: natural.
Wood stone is cat's eye, tiger's eye, tiger's eye stone, cat's eye stone, also known as "cat's eye". It is an amorphous silicon oxide with obvious color change and halo. Stone has the aura of natural Kimura, and it is also named after the eyes of cats, tigers and other cats. Often used as a gem, it can be blessed by the Buddha when worn.
Wood stone is a kind of timely aggregate that retains the structure of asbestos fiber. Its color and texture are very similar to those of trees, hence its name. The largest lignite deposit in the world is located in transvaal province. In addition, it is also produced in Brazil, Xichuan, China and Henan. The colors of wooden stone are usually brown, brown, blue and yellow-green alternate colors, and brownish red, brownish red,
It is composed of iron precipitated from asbestos in the middle of the pores of fibrous timely particles, and the fine fibers are very obvious. Wood-changed stone has a fine texture, a strong silky luster, and is generally translucent. Its hardness is relatively high, reaching 6.5 and its toughness is good. The main varieties of wood stone are tiger's eye stone and eagle's eye stone, of which yellow-brown wood stone is called tiger's eye stone and blue wood stone is called eagle's eye stone. Wood bian stone is a kind of low-grade gem raw material, which is generally used to make necklaces or carved ornaments. Whether the texture is delicate, the color is elegant and the number of blocks is the key to judge its quality. If the texture is fine, there are no cavities and impurities, and the weight is above 10 kg, it is a first-class product.
Mubian Stone is produced in Luodian County, Qiannan Buyi and Miao Autonomous Prefecture, Bijie Prefecture, zhijin county and other places. The stone is dense and tough, with a hardness of about 6.5 degrees, and has many colors such as yellow, tan, brownish purple, blue, blue-green and blue-gray. Its fibers are oriented and densely arranged, and its appearance is very similar to that of wood grain structure, with silky luster and glassy luster, slightly transparent or opaque. High-quality wood stone is dense and delicate, and can be carved well. It is a medium-grade jade raw material, which can be used to make ornaments and handicrafts.
Luodian wood kerb is produced in the contact metamorphic zone between diabase and sedimentary rocks, and it is the product of further replacement of alkaline amphibole asbestos by SiO2 _ 2 solution. Diabase intrudes into a set of siliceous carbonate strata of the Lower Permian Maokou Formation and Qixia Formation. The wood-changed stone in Luodian County belongs to the cat's eye of wood-changed stone, which is mostly grayish green and glassy, with a density of 2.65g/cm3 and a refractive index of 1.54. The mineral composition is timely and amphibole asbestos, which has a fibrous structure and has a cat's eye effect after being processed into an arc.
trait
Tiger's eye stone is often cut with convex gems, which can best highlight the cat's eye of the tiger's eye stone itself.
Tiger's eye stone can turn red after micro-thermal processing. The beautiful honey-colored tiger's eye stone may pretend to be another kind of higher-value cat's eye stone "golden emerald", but the effect is usually not satisfactory. Gemstones made of artificial glass fiber are common substitute stones for tiger's eye stone, and this kind of glass fiber can also be made into many kinds of gems.
In addition, there is a kind of rock related to tiger eye, called iron tiger eye. Iron tiger eye stone is a kind of ore infiltrated with natural tiger eye stone, ruby and black hematite. Its color and light contrast is gorgeous, and it is often made into jewelry, high-priced decorations, prayer beads and gems embedded in handles. Iron tiger eye stone and tiger eye stone are mostly collected from South Africa and Western Australia. The main component is silicon dioxide, and its density is about 2.64 ~ 2.7 1. The timely color consists of crocidolite and acidified iron. The famous origin of Tiger Eye Stone mainly comes from the United States, South Africa, Canada, China, Brazil, Namibia, India and Myanmar.
distinguish
Tiger's eye stone is a kind of wood-changed stone. Under observation, it has a wooden structure, which is popularly called imitation wood stone. It's usually brown. The reason why it is called Tiger Eye Stone is that it likes Tiger Eye Stone. Each bead has a bright line under different light angles. When the bead rotates, the bright line moves with it. If it doesn't move, it's fake. It may be of medium quality, there may be few or no bright lines, or it may not be in the center.
There are three kinds of tiger's eye stones: yellow tiger's eye stone, red tiger's eye stone and blue tiger's eye stone. However, the blue-gray blue tiger's eye stone and reddish-brown red tiger's eye stone are few in number, mostly yellow-brown, and there are silky light lines in the gem. The price of tiger eye stone ranges from 100 yuan to tens of thousands of yuan. The price of tiger eye stone depends on the color. Generally, the top grade is the one with flawless surface and clear eyeliner in the middle.
Identification method of tiger's eye stone:
First, look at the light, there will be some tiny stripes or fibrous substances, and the temperature in the crystal stone is generally low, so it feels very cold in your hand.
Second, the real natural tiger eye stone, its luster will change with people's health. A person's body will become shiny and a little shiny when it is good, and it will become dull once it is poor.
classify
According to its color, it can be divided into four types:
Yellow tiger eye stone
That is, the most common "tiger's eye stone" or "tiger's eye stone", the tiger's eye stone is in the middle or both sides of the fracture zone in the form of veins or different sizes, the ore is in the fine-grained variegated structure or fibrous structure, and the block structure, the blue asbestos is distributed vertically, horizontally, obliquely and in clusters, and the blue asbestos fibers are distributed in different directions and variegated. Due to the late limonitization, the tiger's eye stone is golden yellow or yellowish brown, with strong silk luster or diamond luster, slightly transparent or translucent, hardness above 7 degrees, and has a strong cat's eye effect, forming a banded "living light" or "light absorption". The yellow tiger's eye stone is as domineering and fierce as cat's eye, emitting bright light, which makes people increase their courage and confidence, struggle bravely and create more wealth. Some people also call Tiger Eye Stone Wang Mi Stone, which can bring good luck and wealth to husbands. The noble and domineering tiger's eye stone bracelet reflects the bright light like a cat's eye, inspires courage, brings confidence and firm belief, and makes people brave.
Blue tiger eye stone
This is "eagle eye stone, eagle eye stone", chemical formula (SiO2). Pulsed, locally lenticular. The pulse width is 2 ~ 5 cm, the color is single, crocidolite is irregularly arranged, fine cracks are developed, and the degree of silicification is low. You can see the hard and brittle bluestone cotton fiber. The ore is in fine-grained structure, fibrous structure, block, honeycomb, strip or shell structure, with strong silky luster, slightly transparent or translucent, and has luster or strip "living light".
Tiger Eyes
Lenses with different sizes are produced in the cracks containing blue asbestos, and the color is single, and iron oxide films are seen locally; Blue asbestos fibers are arranged regularly or relatively regularly, with fine-grained fibrous structure, dense block structure, strong silk luster and obvious ribbon-shaped active light. The red tiger stone with good texture shines crimson at different angles.
Multicolor tiger eye stone
Also known as "zebra tiger's eye stone" or "zebra tiger's eye stone", it is located in the middle or both sides of the broken alteration zone, and it is red, blue, yellow, milky white, etc. It is produced in blue asbestos or seasonal veins. Blue asbestos fibers are irregularly arranged.