Rock group | Metamorphic |
Metamorphism type | Regional |
Protolith | It goes like this:
Peat |
Coal in hand sample
Bituminous coal
Allegheny Formation bituminous coal
Coal and pyrite intermingled
Anthracite
Anthracite displaying greasy lustre
Coal in thin section
Stay tuned for explorable images!
![](http://blogs.nvcc.edu/mineralogy/files/2020/10/50HD0199-1024x768.jpg)
![](http://blogs.nvcc.edu/mineralogy/files/2020/10/50HD0201-1024x768.jpg)