Classification of agate

(1) According to the color:

1. Red agate: red agate, the ancient red jade. Red agate is the top grade in a variety of agates. Therefore, in the "Ge Gu Essentials", there is a saying that "agate is not red."

2. Blue agate: refers to agate in blue or blue and white. This is a very beautiful agate, the quality of the color is dark blue, the second is light.

3. Purple agate: Purple agate, mostly a single purple, the quality of the color is like amethyst, and bright. The second is light, or not bright enough, commonly known as "boring."

4. Green agate: green agate. Green agate is not seen in nature. At present, the green agate on the Chinese jewelry market is almost artificially colored. Its color is dark green and some are like jade. The color of the green agate is “small”, the texture is not green, and the texture is brittle.

5. Black agate: black agate. Black agate is rare in nature. At present, the black onyx in the Chinese jewelry market is artificially colored, and its color is dark and easy to mix with other black jade. Its hardness is greater than that of black slate.

6. White agate: Agate with white tone or colorless, in fact, some belong to white chalcedony, which is mostly used to make beads, and then artificially colored, which can be colored into blue, green and black.

7. Agate in other colors: In addition to the above-mentioned agate, other colors of agate can be named according to different colors.

(2) According to the texture structure:

1. Wrapped agate: Agate with a fine-grained structure, also known as "agate." Sometimes the fine lines can be as fine as silk, and there are many variations in color, which can be further divided into the following varieties: onyx, red onyx, red and white onyx, black and white onyx, brown and white onyx, brown onyx. .

2. Ribbon agate: a wide agate with a wide band. It appears in a single color, that is, the aforementioned red agate, blue agate and the like. However, the colorless ribbon agate does not necessarily have to be artificially colored. At present, in China's jewelry industry, it is generally not used for artificial coloring of ribbon agate, and it is preferred to use the raw material in the chalcedony to carry out such dyeing.

(3) Divided by transparency:

1. Transparent agate: agate that is transparent like water. In all types of agate, the higher the transparency, the better the quality. Agate that is completely transparent like water is rare, and usually translucent is the best.

2. Opaque agate: The light that passes through the agate is called opaque agate.

3. Translucent agate: agate between 1 and 2. This variety is most common in agate, but translucent should not be called transparent.

The higher the transparency, the better the quality.

(4) According to the characteristics:

1. City Agate: In the stalked agate or banded agate, if there is an angular structure resembling a "city profile", it is called a city agate.

2. Moss agate: When agate is mixed with chlorite minerals, sometimes a mossy or dendritic pattern is formed, which is called moss agate.

3. Yun Agate: Agate with a sense of cloudiness.

4. Fire agate: This is an agate containing iron oxide plate crystals in the agate strip. It is named a fire agate because it contains a flaming glow in the sunlight.

5. Flash agate: Agate with many black or dark stripes appearing by the agate strips.

6. Water agate: A variety of natural liquids contained in agate. The liquid is usually wrapped in the center of the spherical agate, and is named after the shape of the animal's gallbladder.

Since ancient times in China, the varieties of agate have been divided very finely. In addition to the above-mentioned varieties, there are still “Jinjiang Agate” with brocade on the base, a white zygote on the black base, and the descendants of the two generations. "Pulp agate" with light-colored splashes, "sauce agate" with purple spots, "bamboo agate" with bamboo-like patterns, "curved agate" with scorpion-like pink flowers, and so on. However, these varieties and names are rarely used today, and are more common in historical records.

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