Clay -- read some of the other questions and answers for more information.
A glass and a ceramic mug
Ceramic mug (apex)
Coffee mugs are usually made of ceramic earthenware materials instead of glass, because materials such as porcelain retain heat better than glass. If glass gets too hot, it will shatter.
an insulator
Neither, I would drink it from a ceramic mug.
Ceramic coffee cups come in a variety of sizes: from ones for espresso to lattes. There is, therefore, no single answer.
Friday Night Weekly - 2013 Cat on a Hot Ceramic Mug 1-10 was released on: USA: 15 November 2013
An insulated mug will keep liquids hot for several hours. If the question refers to a typical styrofoam cup, that is the one that will cool the fastest. Heat equalises more quickly with the outside temperature.
There are two benefits to using a plastic coffee mug. The obvious benefit is that a plastic mug would be much cheaper than ceramic. The biggest benefit is that it is not breakable.
Perhaps because the glass is in amorphous structure and ceramic is in crystalline structure. Glass is a better conductor of heat than ceramic is.
ceramic is not made of metal. Ceramic objects are made of clay.
Ceramic mugs are available on the Starbucks website at prices ranging from $8.95 for a basic plain coloured mug to $34.90 for designer mugs by Masahiro Mori.