The so-called primary clay (residue) is a type of clay that is produced from the weathering of rocks feldspatik by endogenous force that does not move from the host rock (rock origin), because the clay does not move so it is more pure than the secondary sticky clay. In addition to hydropower, steam heat out of the earth have contributed to the formation of primary clay.<\/p>\n
Because no water swept away and not mixed with organic matter such as humus, twigs, or leaves rot and so on, then the white clay 0 or dull white. Mature temperatures ranging between 1300 C-14000C, even reaching 17500C. Which include, among others, the primary clay: kaolin, bentonite, feldspatik, kwarsadan dolomite, usually found in places higher than the location of the secondary ground.<\/p>\n
In general, hard rock basalt and andesite will give red clay while the granite will provide white clay. Mineral quartz and alumina can be classified as a type of primary clay as a byproduct of the weathering of rock that produces feldspatik kaolinite clay.<\/p>\n
Primary clay has characteristics: white to dull white tends to coarse grained, not plastic, high melting power, power losses are small fireproof In the dry state, the primary clay is very fragile, so easily ground into flour. This is due to the particles formed are not symmetrical and angled-corner unlike secondary clay particles in the form of parallel plates.<\/p>\n
It can simply be explained by the cross-sectional image slices of quartz particles that have been raised several thousand times. In the picture below looks both particles coated layer (water film), but because the shape is not flat \/ asymmetric, the water layer is not interconnected, consequently the particles are not mutually slide.<\/p>\n<\/div>\n
![\"clip_image001\"](\"http:\/\/lh3.ggpht.com\/-n_49j3f1GvU\/U3qZJ0cFAOI\/AAAAAAAAFVA\/X4WS-lEci3g\/s1600-h\/clip_image0013.jpg\" "\\"clip_image001\\"")
<\/a><\/div>\n