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niether. Graphite is a mineral, not a rock.
Compaction
Clastic rocks are composed of broken pieces of older rocks that have been broken up by the process of weathering and are therefore sedimentary in nature. The "clasts" (bits of older rock) may vary in size.
Deposition, compaction, and cementation are the three steps needed to create a clastic rock formation. Clastic rock is made out fragments of other rocks.
Cementation
Sedimentary rock can form in more than one way. The majority of sedimentary rock is clastic sedimentary rock, formed from the weathering and erosion of existing rock. The steps in its formation are listed below. Steps 4 and 5 are often listed together as the process of lithification.Weathering of pre-existing rock into smaller pieces.Erosion and transportation of weathered rock particles (sediments).Deposition of eroded sediments.Compaction of deposited sediments.Cementation of compacting sediments.For further explanation of sedimentary rock formation, see the related question below.
Cementing is not a process involved in the formation of sedimentary rock.
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The three processes are deposition of the particles or clasts, compaction from overburden and lithostatic pressure, and cementation of the particles by the precipitation of minerals out of the solution which surrounds the particles.
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Breccias are a relatively common clastic sedimentary rock.
niether. Graphite is a mineral, not a rock.
When rock sediment is lithified, a sedimentary rock is formed. The two processes involved in lithification are compaction and cementation.
Clastic sedimentary rock is a product of the weathering, erosion, and diagenesis of pre-existing rock.