Agate is a kind of quartz among the semi-gemstones. Agate is characterized by its fineness and light color. Agate is semi-gloss, matte, and luster glass. Agate color is from white to dark gray and black, yellow and red, green and blue light, and in the second grade stone is renowned jewels. 

Other identified areas: 
East of Ghaen near Shahrokht in a plain called Bamroud,   Southwest Trudeau, Central Alborz and Kerman.

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Gemstones have different sources and pressure and temperature are two factors that are involved in their formation. In general, the materials and minerals that make up the gemstones are including:

Thus, amygdala to geodesic shapes is formed on the surface of the earth, which is composed of layers with different colors of agate. Some of them are filled with layers of agate while others have holes in their center. The presence of layering in these structures indicates the periodicity of sedimentation of agate layers, which can be attributed to the alternating periods of activity of hydrothermal solutions.
 

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Qom Agate Reserve
Qom agate reserve is geographically located at 25 km of Tehran highway and 5 km to the right of the highway. This reserve is one of the famous agate mines of Iran, which is currently being exploited. The rocks that contain the agate deposit of Qom are Eocene andesite. Hydrothermal solutions trapped in the voids and voids of volcanic rocks have over time formed chalcedony geodes and crystals. Qom agate consists of chalcedony and jasper. The definitive reserve is 27.395 million tons of andesitic ore.

The role of this fault in the infiltration of hydrothermal solutions has been a cause of alteration in this region. In cuts caused by repeated movements, this fault in some parts of agate in the form of cement encloses the shear particles and connects them, and in some places, agate is deposited as a thin layer on the shear parts. The predominant color of these agates is blue. The rotation of hydrothermal solutions along the fault has caused the formation of agate in the area.

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In general, agate can be sourced from silica minerals or hydrothermal fluids, or in other cases from amorphous silica gel or hydrothermal fluids (hydrothermal fluids) or atmospheric waters. Agate is found in various geological environments in gas cavities, in acidic volcanic rocks, and fossil rock fractures. Most believe that the formation of agate coincides with the formation of its source, but some believe that the formation of agate is its source millions of years after the formation of stone.

Agate volcanic hydrothermal deposits are sometimes formed in acidic volcanic rocks. These types of reserves are oval and have an uneven surface. This type of cross agate reserves 15 - 1 cm and sometimes 30 cm, and in exceptional cases to 1.2 to 0.9 meters looks. Stone cover silicified rhyolite was approximately 25-50%of the rock mass will form. The cavities in the cover stone are partially or filled with agate.

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