Diamonds are harder than chalk.
Diamonds are minerals, composed of the element carbon.
Diamonds are composed of carbon.
Diamonds are formed from carbon, which is a mineral.
Nothing. Only other diamonds can cut diamonds.
Minerals are required to be naturally occurring. Synthetic diamonds are not.
diamonds
Diamonds are pure carbon.
Diamonds are formed from carbon.
Diamonds formed from carbon in the lab, are diamonds formed from the mineral carbon.
Mined diamonds are elements -- minerals. Man-made diamonds can be fabricated out of 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."