Agate has a very long history. About 1 100 million years ago, due to crustal changes, underground magma erupted in large quantities. When lava cools, steam and other gases form bubbles. When the rock freezes, the bubbles are sealed and many holes are formed. After a long time, the pores were immersed in a solution containing silica and condensed into silica gel. Fusible components of iron-bearing rocks enter silica gel, and finally silica crystallizes into agate.

Main components of agate:

The main component is silica, which is often layered repeatedly because it alternates with hydrated silica (silicic acid). Because it is mixed with oxidized metal, the color can range from extremely light to dark. ?

Red, blue, purple and pink are the best agates for extending information, which require transparency, no impurities, no sand cores and no cracks; Among them, the block weight above 4.5 kg is super grade, the block weight above 1.5 kg is first grade, and the block weight above 0.5- 1.5 kg is second grade.

Pictographic agate can form pictographic patterns (such as figures, landscapes, flowers and birds, fish, insects, landscapes, aquatic plants, etc.). ) because of its excellent texture and beautiful color, it is of great collection value.

References:

Baidu encyclopedia entry-agate