Changes

The art of [[diamond]] cutting exploits the many possible cleavage planes in the diamond crystal in order to create a beautifully [[refraction|refractive]] [[gem]] from the raw material.

The art of [[diamond]] cutting exploits the many possible cleavage planes in the diamond crystal in order to create a beautifully [[refraction|refractive]] [[gem]] from the raw material.

[[Graphite]], interestingly another pure [[carbon]] crystal, is so weakly linked between its layers that it is used as a [[lubricant]], since the layers slide readily over one another.

[[Graphite]], a pure [[carbon]] crystal like diamond, is so weakly bonded between its layers that the layers slide readily over one another; hence its use as a [[lubricant]].

[[Category:Geology]]

[[Category:Geology]]