Ghost Rock
Ghost Rock is a strange mineral that resembles a lump of white or grey coal, often containing black-green veins running through it. These veins can sometimes give off a faint green glow, particularly when the Ghost Rock is being used.
Ghost Rock produces an enormous amount of heat when burned and can be used as a fuel for machinery, furnaces and other devices. It burns for considerably longer than normal coal, making even small quantities extremely valuable.
Ghost Rock is also used by Mad Scientists as a source of power for their inventions. Its unusual properties allow it to produce levels of energy that should be impossible for such a small amount of material.
Ghost Rock is dangerous to work with, however. It can react unpredictably when subjected to pressure, heat or other forms of energy, and accidents involving large quantities can be extremely destructive.
Nobody is entirely sure how Ghost Rock is formed, although it is often found deep underground and is sometimes associated with other strange minerals, such as Ghost Quartz.