Okwu Mmalite ngwaahịa: 1, Junda chrome corundum bụ alumina ntụ ntụ dị ka isi ihe eji eme ihe, na-emegharị na chromium oxide, na-agbaze site na nnukwu ọkụ ọkụ arc. 2, agba bụ pink, hardness na ọcha corundum yiri, ike dị elu karịa ọcha corundum. Ihe abrasives emepụtara nwere agwa ...
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