Rice topaz, also known as rosin yellow, is named for its color like yellow rice. It is mainly produced in the area of ​​Shuyang County, Hubei Province. Its jade is delicate and soft, and its color is pure and clear. It is called “citrine, yellow agate, golden jade” and has a very moist grease luster and waxy luster. Tanshan Town, Jixian County is known as “the hometown of Chinese rice and yellow jade. The color and texture of the rice topaz in Tanshan are recognized as the best in Asia. The “beiyuyu”, “white marble” and “wave gray” have been discovered in Ganxian County. , "Furong red" and many other varieties.

The beige jade is divided into different types according to the different jade textures and colors. However, because the pattern of the stone is strange, there is no clear standard for this classification. The following classifications are for reference only: corrugated yellow - the pattern is like a layer of waves, step by step, layered, or like Dajiangdong, Hao The mighty and magnificent. Lightning Yellow - A sudden twist of white lines on a piece of jade, yellow lines, red lines, as if the irregular lightning in the sky, touching, magical and magnificent, very artistic. Ice sallow yellow - like the formation of icy yellow liquid, there is a piece of ice in the jade state. Small beige - color such as millet, light color. Gold jade - color such as gold, dark color. Natural corn yellow will have a variety of patterns coexisting or the pattern is different from the above. Therefore, there are many subjective factors in the classification of corn yellow. Beiyuyu-Jade is one of the more precious stones in the stone variety. Its material is very fine, the light transmission effect is good, the moisture is bright and beautiful, and it is naturally transparent. The overall elegance is like the vast galaxy, natural and freehand, and it is easy and free to decorate the simple and elegant living space. Because Fuyang corn yellow is quite expensive, the corn yellow that we see on the market is some small pendants or the decoration of corn yellow as a large object.

Technical requirements for quality of Minxian Yuhuang jade I. Requirements for raw material mining and processing 1. Mining requirements: Within the scope of production, the mining license for the rice top mineral resources is obtained according to law. Safe, non-polluting and non-destructive mining. 2. Second, the quality characteristics 1. Sensory features: (1) Classification: 1 by color: beige topaz, gold jade, small beige. 2 according to the texture is divided into: ice yellow, lightning yellow, ripple yellow. (2) Grade: Item grade first grade second grade third grade color orange yellow, no variegated orange yellow, a small amount of variegated light yellow, a small amount of variegated texture particles finer, no chaotic lines finer No chaotic lines, coarse particles, fine stripes, shiny glass, glossy glass, glossy, translucent, translucent, translucent, translucent texture, delicate, dense, delicate, dense, dense 2. Physical and chemical indicators: project index Mohs hardness 3.0 ~ 4.0 density (g / cm3) 2.7 ~ 2.8 optical characteristics heterogeneous aggregate amplification detection white yellow phase distribution microscopic features columnar structure infrared spectrum shows calcite absorption spectrum X-powder crystal Diffraction shows that the calcium peak of calcite content (g/100g) ≥ 953. Safety and other quality technical requirements: product safety and other quality technical requirements must comply with relevant national regulations.

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Producers within the scope of the county's rice-producing areas may submit an application to the Quality and Technical Supervision Bureau of Jixian County, Hubei Province for the use of the “Special Mark for Geographical Indication Products”, which shall be reviewed by the Hubei Provincial Bureau of Quality and Technical Supervision and reported to the General Administration of Quality Supervision, Inspection and Quarantine for approval. . The testing organization of Jixian Mahuangyu is selected by the Hubei Provincial Bureau of Quality and Technical Supervision in the testing institutions that meet the qualification requirements.