Biscuit, or bisque.
Unglazed pottery is called bisque or biscuit porcelain. Unglazed pottery is still popular and more expensive than the same piece which had been glazed because the unglazed pottery has to be perfect in every way without cracks. next time research on your own
Streak
Graphite isn't a ceramic material itself, however it can be made into a ceramic material
Ceramic mugs are generally safe. Some glazes used in ceramics can leach metals into liquids used in them: responsible makers test the glazes used on items intended for food use before selling them. It is possible for porous ceramics to harbor bacteria, especially if the glaze is cracked or crazed, but there is little risk if the item is washed before use, and is not used for storage.
Yes you should.. the unglazed ceramic is not good for you, I belive it's a long the lines of one of the cancer causing.
A salt pig is a ceramic container whose inside is not glazed. The unglazed ceramic absorbs excess moisture in the salt and keeps it from clumping up.
A glass and a ceramic mug
The way to tell if a ceramic tile has glaze or not is to look at it and touch it. An unglazed tile witll have a rough feel and dull look to it. A glazed one will have a shiny look and feel smooth.
Baked clay objects are most commonly referred to "ceramic" or "earthen," as in "an earthenware pot." Depending on the makeup of the clay and the baking process used, more specific terms may be used, such as: stoneware, earthenware and porcelain.
Terracotta is a clay-based unglazed ceramic, although the term can also be applied to glazed ceramics where the fired body is porous and red in color.
A ceramic is generally an inorganic, nonmetallic material; note that also metallo-ceramic materials exist.
The material that is used for pem membrane is the ceramic material.