Agate is an expression that does not describe a particular metal, but is called a group of different forms of silica, especially Chalcedony, is a creamy type of porous aloe vera, which is in the shape of a white agate and is mainly in the form of layers in sedimentary rocks, The colors may vary from white to gray to black. The lines may be pale red, yellow or blue. In some cases, these colors result from impurities such as iron oxide and manganese oxide. The types of agate vary in their patterns. The Yemeni agate is a kind of agate Miz parallel contours located on a flat surface while opal-kind lines they form circles spread from the center to the outside while Garnet thin moss-like planus type.
The gate belongs to the stones of the wire and is composed of the non-crystallized platinum. It is chemically composed of SIO2, iron oxide, sometimes nickel, and may be surrounded by bubbles of water or gas, scientifically known as ANDROS. It consists of the deposition of water solutions and is present in the lava and fills the cavities created by it The gaseous emission during the deposition of magma as found in the sedimentary rocks and the pebbles, which is of different colors and translucent waxy or translucent or opaque waxy, the agate belongs to the six crystallization systems and its specific weight between (2.60 - 2.65) and the refractive index between (1.544 - 1.553)
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