Ceramics-Clay

=__Clay__= =__Resources__=
 * __**Earthenware**__
 * Fired At Low Temperatures, Up to 1,200°C/2,200°F, to avoid glassiness
 * Glost fired at 950 - 1050 °C
 * Red, orange, yellow, or white colors.
 * Porous, coarse, and Opaque
 * Blend of materials generally includes iron, quartz, and feldspar
 * Not watertight
 * Usually glazed
 * Used for pottery, tableware, and decorative objects
 * __**Terra Cotta**__
 * Terra Cotta is a type of Earthenware which is left unglazed, usually used for objects such as flowerpots and some pottery.
 * **__Stoneware__**
 * Generally a mixture of other clays
 * Fired around 2,500 degrees F
 * Often Gray when moist; light grey when fired
 * Colors are greatly affected by the type of firing
 * High Plasticity
 * Easy to manipulate
 * Nonporous
 * **__Kaolin__**
 * Very light in color
 * Light grey when moist, white when fired
 * Difficult to work with, low plasticity
 * Fire at about 3272°F (1800°C)
 * Often mixed with other clays, most often ball clay
 * Used for porcelain
 * **__Ball Clay__**
 * Highly Plastic
 * Dark Grey when moist, light grey when fired
 * Shrink excessively during firing
 * Prone to warping
 * Increase workability and plasticity when added to other clays
 * **__Fire Clay__**
 * Fire at about 2696°F (1500°C)
 * Have spots of iron, causing a speckled appearance once fired
 * Used in stoneware clay bodies to increase their maturation temperature
 * Also used to create cone packs (which monitor temperature), as supports for ware or shelving, and to seal doors.
 * Preferred clay for piping and sanitary ware
 * 1)  "Clay Types, Geologic Origins, Working Properties." __Links to Glendale Community College: AZ and CA __. 2 May 2009 <[] >.  
 * 2) Peterson, Beth. "Clay Basics - Basic Information About Clays Used in Pottery." __Pottery - The Magic of Ceramics __. 2 May 2009 <[] >.  <span style="color: rgb(128, 128, 0);">
 * 3) <span style="color: rgb(128, 128, 0);">Playoll, Robert. "Different Types of Pottery Clay." __<span style="color: rgb(128, 128, 0);">EzineArticles Submission - Submit Your Best Quality Original Articles For Massive Exposure, Ezine Publishers Get 25 Free Article Reprints __<span style="color: rgb(128, 128, 0);">. 2 May 2009 <<span style="color: rgb(0, 0, 0); font-family: arial; font-size: 13px; line-height: 19px;">[] >.  <span style="color: rgb(128, 128, 0);">
 * 4) <span style="color: rgb(128, 128, 0);">"What is Earthenware?." __<span style="color: rgb(128, 128, 0);">wiseGEEK: clear answers for common questions __<span style="color: rgb(128, 128, 0);">. 2 May 2009 <<span style="color: rgb(0, 0, 0); font-family: arial; font-size: 13px; line-height: 19px;">[] >.  <span style="color: rgb(128, 128, 0);">
 * 5) <span style="color: rgb(128, 128, 0);"> <span style="color: rgb(128, 128, 0);">"earthenware - Hutchinson encyclopedia article about earthenware." __<span style="color: rgb(128, 128, 0);">Hutchinson Encyclopedia __<span style="color: rgb(128, 128, 0);">. 2 May 2009 <<span style="color: rgb(0, 0, 0); font-family: arial; font-size: 13px; line-height: 19px;">[| http://encyclopedia.farlex.com/earthenware] >.