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Keywords: Cobalt-rich crust; Compressive strength; Abrasivity; Friability; Cutting test EN Cobalt-rich crust Compressive strength Abrasivity Friability Cutting test 2929 2934 6 06/05/20 20200601 NES 200601 Introduction Hydrogenetic cobalt-rich ferromanganese crusts (cobalt-rich crusts, CRCs) are expected as potential mineral deposits for rare earth elements and platinum group elements as well as cobalt, nickel, and manganese (Manheim [8]; Rona [13]). Thereafter, Yamazaki et al. ([17]) reported the compressive strength of CRCs and substrate rocks, and then Wu and Chen ([16]) reported the shear strength of CRCs. 1 Porosity, P-wave velocity, and uniaxial compressive strength of the cobalt-rich crusts (CRCs) and substrate rocks. a Relation between porosity and uniaxial compressive strength. The curves for the CRCs are located on the left side of those for the substrate rocks; that is, the debris of the CRCs is smaller than that of the substrate rocks after crushed. [Extracted from the article]