Thanks team.There has already been a mention of kaolinite in a question on minerals, see this site. My team are correct, the difference between ordinary clay pots and porcelain pots is the temperature at which the clay is ‘fired’.
The ‘firing’ process is linked to the temperature of the kiln.
So a porcelain pot is a pot heated up to much higher temperature than that of other pots. This causes the clay to form a new mineral called Mullite.
For more ‘hardness’ information you can go to this Science Master Special.
Updated 15/01/18 Experiment added.