1, composition and formation process
Stone is a broad concept, which can include any naturally occurring mineral or mineral collection. These minerals may be formed by natural processes such as volcanic activity, crustal movement, weathering and erosion.
Emerald usually refers to minerals or rocks with special aesthetic and commercial value, such as jadeite, hetian jade, ruby and sapphire. These minerals usually need to be formed under specific geological conditions, such as high temperature and high pressure, environment rich in specific elements and so on.
2. Physical and chemical properties
The physical and chemical properties of stones can be very diverse, depending on their composition and formation process. Jade usually has some special physical and chemical properties, such as high hardness, good luster and bright color. These characteristics make jade visually attractive, so it is used to make decorations and works of art.
3. Value and use
Most stone materials are mainly used for building materials, paving, gardening decoration and so on. Because of its aesthetic value and rarity, jade is used in jewelry, artworks, collectibles and so on. , and usually has high economic value.
Jade identification standard
1, jade texture: refers to the delicate and moist degree of jade. The quality of jade should be classified and evaluated according to the specific jade species, but no matter what kind of jade, it can not be separated from the four basic breakthrough points of "water, permeability, oil and lubrication".
2. Hardness of jade: Hardness refers to the ability of jade to resist external forces (such as pressing, engraving and grinding). The higher the hardness, the more difficult it is to process and the better the quality of jade.
3. Toughness of jade: refers to compressive hardness, or indentation hardness, that is, absolute hardness. Refers to the ability to resist external shocks, which is also called toughness in the jade industry. The highest compressive hardness in nature is black diamond, marked as 10 degree, followed by Hetian jade, with a compressive hardness of 9 degrees.
4. Specific gravity of jade: refers to the density of jade. Different jadeites have different densities, and the greater the specific gravity, the higher the quality of the same jadeite.
5, the color of jade: color is the most intuitive visual experience of jade, to a large extent, often because the color of a piece of jade determines its quality positioning. Green is the best jade, and the value of red and purple jade is only 1/5 of green jade.