Given a sedimentary rock composed of shells or pieces of shells; is this rock a chemical type of sedimentary..?

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chemical sedimentary rocks form in place precipitation of minerals in sedimentary environment. classic examples limestones, rock salt , gypsum. in question implication rock composed entirely of shells no matrix. type of rock called coquina. in normal geology textbooks classified chemical sedimentary rock. in fact grouped limestones because of composition.

however, if shells show sign of transport rounding of edges or broken pieces (as in question), rock considered clastic (also called detrital). chances rock composed entirely of shells or shell fragments coquina , shells transported environment of deposition (most beach). technically make rock clastic sedimentary rock.

instructor has background in geology.

given sedimentary rock composed of shells or pieces of shells; rock chemical type of
sedimentary rock , why or why not?


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