Carbon
yes all of them are minerals.Another AnswerNone of them are minerals: coal, diamonds and graphite are formed from the mineral carbon. There is a class of minerals, according to Wikipedia: "The halide minerals are the group of minerals forming the natural salts."
yes graphite
Graphite schist is mainly composed of graphite, but can also contain other minerals, such as pyrite, depending on the sample
In a black pen graphite is used.
I think graphite......,
graphite copper zinc
Diamond
Naturally occurring, commonly used minerals.
Volcano + Minerals
patroleum and graphite. sometimes silver is in it too!
graphite, clay, bauxite, etc.