Usually we call the green jadeite "Cui", and "ç¿¡" is the jadeite dominated by red. It is known that the best green jade is precious and scarce. The same color is bright red, the transparency is good, and the texture is moist and natural. Rare, you can't ask for it, so how much do you know about the twilight in the jade?
1, 翡色玉ç§
The jadeite jade is a jade stone mainly composed of hard jade minerals and iron oxide. The jadeite crystals are medium-coarse crystal, micro-fine crystal and microscopic columnar aggregates. Under the action of crystal transformation, it can form fibrous and granular. .
2, red and brown series for the twilight series
The color of jade can be divided into four series: red-brown series, green series, white series, purple series. Among them, the reddish-brown series is called ç¿¡, and the reddish-brown can be subdivided into red, reddish brown, brown, brownish yellow, light brownish yellow, and yellow.
3, ç¿¡ color and FeO content are closely related
The color of jadeite is related to the trace chemical element FeO content, and no other information has been obtained. Semitransparent white jateite FeO content is generally 0-0.05%, semitransparent green jateite FeO content is generally 0.14%, red jadeite FeO content is generally 1.25%.
4. Twilight is closely related to iron-bearing minerals
Twilight is a color that is related to the iron-containing minerals category. The iron-bearing minerals are microscopically-super-microscopically adsorbed in the jade grains and in the cleavage. The water-fibrite ore is gem-red, the water-needle iron ore is light brown-yellow, the fibrite is reddish brown, the goethite is brown and yellow, and the water hematite is red, due to differences in mineral composition. Different colors.
5. Twilight is the product of geological action
Twilight is the product of jadeite under different geological conditions. The source of iron is secondary and primary. "Laoshan jade" is a gravel in the riverbed. It is deeply buried in the gravel clay layer for a long time. Under the weathering effect, it is affected by the gravel clay layer to form an oxidized "shell". The red-brown series "shell" is a secondary iron impregnation. Caused by. "Xinshan Jade" is a "new" material in the deposit, and a red-brown series of ribbons are often formed along the rock fissures, which is caused by secondary iron infiltration. The twilight produced in the dense jadeite is mostly caused by the iron enrichment during the crystal transformation stage, which should be caused by the primary iron infiltration.
Iron minerals are often formed in open fissures and intersections. Secondary irons are often dip-dyed to form stratiform structures due to intermittent changes in iron solutions. Large fracture channels are more widely impregnated with iron solutions, but the jadeite texture is very loose.
6, the color is very rare
The proportion of twilight in jadeite is very rare, which is determined by the specific geological cause environment. However, the market's twilight jade jewelry is flooding, and undoubtedly a large part of it is artificially colored. Dyeing treatment is to improve the sensory effect of jade jewelry. It is a way to enhance the colorless or variegated jade. However, the natural color and artificial coloring are different. The value is good and can not be dyed. Emerald is pretending to be a natural jade.
7, natural ochre characteristics
The reddish-brown series "shell" jadeite is often eclipsed into hornblende and imaginary fiber hornblende. The ochre is often irregular and uneven in color. The ochre is generally 2-3cm deep in gravel. It gradually became shallower. Microscopic observation of ç¿¡ color is regularly immersed along the mineral grains, no arachnoid phenomenon, oil immersion method to determine ochre jade, ochre has penetrated into the crystal. The color of the crack is deeper and shallower along both sides of the crack, and the iron oxide is often dyed to form a layered structure with no wax and polymer filling.
8, artificial color features
Artificial ochre is often colored by thermal + chemical methods, and iron nitrate and iron sulphate are one of the colorants. On the jewelry, the color is floating, color, no natural layering, color transition, color distribution is independent of rock structure, quenching arachnoid phenomenon is obvious, under the microscope, observing the color of the crack, surface crack Dense internal reflections are noticeable, often accompanied by polymer filling of the same color.
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