Identification method of sheep fat jade

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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.

Pure texture

The tremolite mineral content in the sheep fat jade reaches 99%.

The sheep fat jade exists in the most perfect part of the 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. The hardness of sheep fat white jade is 6ï½ž6.5, second only to jadeite. The toughness and wear resistance are the strongest in jade, the texture is dense and the chemical properties are extremely stable.

Fine structure

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.

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.

Color is sheep fat white

The term "white fat white jade" in the industry means that the whiteness and moistness of this piece of Hetian jade should reach the whiteness and moistness of the fat of the lamb and sheep. The whiteness of the fat is not pale, but rather the whiteness of the oil, slightly revealing a pink hue, yellow or gray hue. When it comes along with other grades of white jade, it makes people feel that this jade is very white and clear. The simplest way to distinguish this jade from ordinary white jade is to watch it under a white fluorescent light. 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 white jade is white in color regardless of the grade level, but it must have a slight yellowish color under the white fluorescent lamp. Therefore, if there is a slight yellow color under the fluorescent lamp, it cannot be called It is a white jade.

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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