What is the difference between siltstone and shale?

The difference between them is…

SILTSTONE: It is a fined grained sedimentary rock consisting of consolidated silt. It has a grain size in silt range, finer than sandstone and coarser than claystones. SHALE: It is a soft finely stratified sedimentary rock that formed from consolidated mud or clay and can be split easily into fragile plates.

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