INFORMATION porcelain/pottery

Hi,

I have been googling quite some time for information about the ingredients
and processes involved in making contemporary porcelain/pottery. But I am
still not satisfied.

It seems as if there are several different opinions about the EXACT
definition of what porcelain is.

The ingredients seem pretty obvious: clay/kaolin/feldspar/quartz.

Some sources say that ALL the ingredients melt into the flux (feldspar),
while others speak about the flux sintering the other ingredients together,
only partly dissolving them.

Can anybody direct me to a website with a comprehensive
description/classification of the different types of porcelain/pottery. Or
if somebody wants to write down an explantion in this group I would
obviously be extremely grateful!

I would also like to learn more about the enamel.

The information -if satisfactory- would be used in a museum display about
feldspar.

Any help is greatly appreciated!

Ron
Norway