--> Figure 5. Even without a silica abrasive, carbonate sand grains produced mud-size particles.

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Figure 5. Even without a silica abrasive, carbonate sand grains produced mud-size particles. This self-abrasion process produced <0.5% of mud from sand fractions in the oolitic sample (WSO) but 3-3.5% in the grapestone (GS). GS1 and WSO1 are identical in composition to GS and WSO, respectively.