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coal is a kind of rock that people call it the black diamond.
There is no competetor to cil in India to produce coal. Sccl in andhra pradesh and tisco partially shares coal production in India. New coal blocks by private sector if start production with high rate of extraction might go for competion in two decades from now.
Coal,Diamond,Natural Gas
coal
the price of coal
Yes, it can be called Black Diamond. Source: Wikipedia under "Black Diamond"
No. coal is coal and diamond is diamond. They are both formed from carbon, but diamond is much harder than coal.
Probably because both coal and diamond are composed of carbon.
Due to physical property of hardness and usability of this natural resource
black diamond
Coal. Carbonado
Diamond can be colorless; but graphite, coal, carbon black are black.
This is in reference to the fact that both are predominately combosed of carbon.
Coal is Black gold
The term 'black diamond' can be applied to coal, meaning the monetary value of this natural resource is genuine and real. However, in the world of gem stones, there is a black diamond -- properly Carbanado -- which is a diamond that is black and more porous than diamonds of other colours.
It is called that because in those days coal could get you alot of money, so did gold. So it was called "black gold".
Coal has been called 'black diamonds'. This is probably because coal and diamonds are both formed from carbon.