Black corundumchinhu chakakosha maindasitiri abrasive chinowanzoshandiswakukuya nokukwenenzvera zvinhu zvakasiyana-siyana. Iyo inonyanya kugadzirwa ne electrofused aluminium oxide (kureva corundum) uye ine zvinotevera maitiro:
Kuomarara kwepamusoro: dema simbi jade yakaoma kwazvo, kazhinji yakatenderedza 9 pachiyero cheMohs, yechipiri chete kune diamond uye silicon carbide. Izvi zvinoita kuti zvive zvakanaka pakugadzira zvinhu zvakaoma.
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