It has been explained that the clay is pure minerals contained in the hot and dense rock, formed due to weathering of the fine particles and most moved by the power of water, wind and glaciers to a lower place and away from the host rock with a particle size are almost the same, while others remain in the location where the host rock is located.
During the move becomes impure clay, minerals lose their binding, the result is a type of clay ranging from coarse to fine with the possibility of changes in color and composition.
The nature of the event, then there is a clay that does not migrate or are in the region of origin, this clay is called clay primer is the end result of a series of processes which is also called the residual clay, clay common example is china clay or kaolin . While the clay is moved from the region of origin and settle in low areas called secondary clay or clay sediment, such as ballclay, red marls (a mixture of clay, sand, and lime), stoneware, etc..
A clay mineral formed from the structure of the particles are very small, especially of minerals called Kaolinite, ie compounds of Alumina Oxide (Al2O3), to Silica Oxide (SiO2) and water (H2O).
Shape of the particles as small plates nearly hexagon-shaped (hexagonal) with a flat surface that can not be seen with the eyes directly, the shape of these particles causes the clay carrying a clay properties (plastic) and malleable when mixed with water , this is because the particles each slide to one another with water as a lubricant.
The clay particles are made of a molekulaluminium (2 Alumina atoms and 3 oxygen atoms), two molecules Silicate (2 Silica atoms and two oxygen atoms), and two water molecules (two hydrogen atoms and one oxygen atom). The formula consists of: 39% Alumina Oxide Silica Oxide 47% 14% water.
Natural changes that take place continuously causes the formation of primary and secondary clay, which also causes the differences found place (deposition) of the clay, in a simple clay origin can be described as shown below.
