Five essentials for identifying sheep fat white jade

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%.

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.

2, the structure is fine - the tremolite in the sheep fat jade is microscopic fibrillar crystallized crystals and aggregates, the crystal size of the tremolite can be determined under electron microscope and optical microscope, the tremolite fiber in the sheep fat jade The length (longitudinal) is 0.033-0.01 mm, and the width (transverse direction) is 0.0006-0.001 mm. 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, water head foot - water head, spirit land is the name of jade transparency, in tremolite jade often from the thickness of 2mm as the standard, white jade in this standard is translucent - opaque, the head of the sheep fat jade shows translucent shape.

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, poor texture can also reveal a slight shallow in white Gray tone.

5, oily weight - sheep fat jade in the process of people's palms constantly touch, self-contained, on the surface of jade produces a "oily" feeling, in some Hetian fine white jade also has this phenomenon, when the sheep fat jade pendant In the water, the jade body is lifted, and the dripping water is not sticky. Therefore, the oily heavy sheep fat is also excellent, and the so-called cotton, which is toughness.