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i'm not sure there are "main" Metamorphic rock types
Wiki User
∙ 10y ago
Wiki User
∙ 12y agoFoliated and non-foliated.
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Why black coal is considered to be a metamorphic rock?
Coal is generally considered a sedimentary rock as it is made up of deposited material (in this case organic matter, mostly from plants) and is eventually covered up by overburden. I'm not going to go into the details of the physical change but the reason black coal might be considered metamorphic is that it has been subjected to more pressure over time which furthers the coalification process. The order of coalification coal: peat -> lignite (brown coal) ->sub bituminous -> bituminous ->anthracite (very rare) everything after lignite is black in colour. If you need this for a report I'd probably look it up though, its been a while since I've studied coal in depth.
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