Refractory mortar 1 part fire clay 1 part portland type 21 part hydrated lime3 parts sandType S mortar2 parts portland type 21 part hydrated lime9 parts sand
Clay needs to be fired to make it into proper pottery, but mortar should not be fired. It sets by chemical action, not by heat. (I'm talking about the sort of mortar you lay bricks with, because you haven't specified)
my guess is: straw, clay, dirt, very fine sand, and gravel
Graphite is mixed with clay to form refractory crucibles due to it's high melting point, inert nature and abilities to conduct heat.
clay is heated and super cooled into a rock then put together with mortar.
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Clay + fire
to make brick you mix clay and fire
swamp+sand=clay
Roll clay and put by fire till its hard and lite colored
Clay or mud like substance. Then it is heated and cooled to form a brick
clay+fire=bricks