clay and clay bodies

clay formation

made of granite turning into feldspar turning into clay

granite

rock clay is made from

feldspar

material from weathering of granite

clay

weathering of feldspar

types of weathering

levigation and hypogenic action

levigation

grinding down of clay particles from water

hypogenic action

water and other chemicals on rocks that dissolve the rock

formula of weathering of feldspar

Na2O/ K2O . Al2O3 . 6SiO2

formula of weathering of Kaolinite

Al2O3 . 2SiO2  . 2H2O

primary clay

form at mother site through hypogenic action

secondary clay

formed through levigation; has more impurities

plasticity

extremely small particle size, hexagonal shaped, mild ionic attraction, and presence of organic matter in the clay

types of clay

kaolin, ball clay, fireclay, stoneware, and earthenware

kaolin

very refractory, white, no impurities, larger particle size, less plastic

ball clay

very small particle size, very plastic, lots of organic matter, white or grey

fireclay

refractory, wide variety of size, grey or buff in color, less plastic

stoneware

versatile, wide variety of particle size, plastic, grey or buff

earthenware

most common, red, most impurities, least refractory, versatile

clay bodies compostions

clay, flux, filler

types of clay bodies

earthenware, stoneware, porcelain

earthenware

low temp, red and whtie earthenemware

stoneware

high temp, wide variety of colors and textures

porcelain

high temp, white, glass like

drying process

greenware, leather hard, bone dry

greenware

any clay that is not firedlea

leather hard

clay that is roughly the consistency of tanned leather or hard cheesebon

bone dry

clay that is dried completely but has not been fired

physical water

water that is added to the clay when mixed

chemical water

water that is apart of the clay chemical compositon

water is roughly how many percent of clay?

25%