EPK
EPK is also known as Edgar Plastic Kaolin or Florida Kaolin. It is a relatively fine-particled and surprisingly plastic kaolin which fires to a creamy white. It shrinks about 13% at cone 9.
Georgia Diamond Kaolin
Georgia Diamond Kaolin replaces Georgia Pioneer Kaolin, which is no longer being mined. It has good greenware strength and fires white. It shrinks about 10% at cone 10.
Georgia Kaolin #6 Tile
Also known as simply #6 Tile or #6 Tile Kaolin, this is a fairly plastic kaolin with good translucency. It fires very white.
Georgia Kaolin Kaopaque
This is a substitute for Grolleg. It is likely not to be as translucent as true Grolleg. See below for more information.
Grolleg (TM)
Also known as English China Clay, Grolleg (a trademark of the Imerys Group) is a kaolin mined in Cornwall, UK and is known for its excellent translucency (due to the very low percentage of titanium in it), but only moderate plasticity. It fires very white, with a shrinkage rate of about 13% at cone 10.
Standard China Clay
Standard China Clay is one of the purest of the pure. It fires very white.
Velvacast
Velvacast is a coarse-grained kaolin used in casting slips. It is not a good choice for a throwing clay body.