How to identify Hetian Yangzhiyu

The white fat jade is the gem-grade material of Hetian jade. It is the best of white jade in pure white color. It has the best luster and texture. It is characterized by: warm and firm, pure and pure, white and flawless, like gelatin, hence the name. The simplest way to distinguish this jade from ordinary white jade is to watch it under a white fluorescent light. The following China Jewelry Merchants Network Xiaobian will introduce to you how to identify the fat jade, let's take a look.

The white fat white jade is facing the fluorescent lamp, showing a pure white translucent shape with a powdery mist. The general white jade is translucent to the fluorescent lamp, but it has no powdery sensation. The biggest difference between the two is that, regardless of the grade of the white jade, it is very white to the naked eye, but the fluorescent lamp must have a slight yellowish shade under the fluorescent lamp. Therefore, if there is a slight yellow color under the fluorescent lamp, it cannot be called Sheep fat white jade. The rare and precious sheep fat jade that meets the stringent standards is absolutely inconspicuous. The identification points of the sheep fat jade must meet five aspects, namely, pure texture, fine structure, water head, color white fat, and heavy oil.

1, pure texture

The mineral content of tremolite in sheep fat jade reaches 99%, and the fat jade is present in the most perfect area for wall rock alteration. When the granodiorite is in contact with dolomite, a series of contact metamorphic rocks are formed, and the dolomite becomes dolomite marble. The late magmatic hydrothermal fluid along the dolomite marble tectonic fissure channel is metamorphic to form tremolite. The surrounding rock erosion is transformed into three kinds of lithofacies of dolomite marble-tunnelized petrochemical dolomite marble-metamorphic rock, and the sheep fat jade is found in the tremolite rock facies.

2, the structure is fine

The tremolite in the sheep fat jade is microscopically crystallized and aggregated. The crystallite size of the tremolite can be determined under electron microscope and optical microscope. The length of the tremolite fiber in the suet jade (longitudinal) is 0.033- 0.01mm, width (transverse) 0.0006-0.001mm, these microscopic, fluffy, felt-like tremolite crystals are intertwined to form a pile-like structure, a felt-like structure, and an interwoven structure.

Microscopic, fluffy, felt-like tremolite crystal aggregates, characterized by orthogonal polarized light, do not exhibit uniform extinction at the same angle.

3, the water head

Water head and spirit land are the names of jade transparency. In tremolite jade, the thickness is usually 2mm. The white jade is translucent-opaque in this criterion. The head of the sheep fat jade is translucent.

4, the color is sheep fat white

Sheep fat white is not pure white, but white with oily luster. Some in white can reveal a slight yellow color, and poor texture can also reveal a slight light gray tone in white.

5, oily weight

In the process of constant touch in the palm of the hand, the fat jade jade naturally produces an "oily" feeling on the surface of the jade. This phenomenon also occurs in some Hetian fine white jade. When the sheep fat jade falls in the water, the jade body is lifted. It can be dripping without sticking, so the oily heavy sheep fat is also very good, so-called cotton, which is toughness.

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