Mchenga woyera wa corundum, ufa wa corundum woyera, corundum wa bulauni ndi ma abrasives ena ndi abrasives wamba, makamaka ufa woyera wa corundum, womwe ndi woyamba kusankha kupukuta ndi kugaya.Ili ndi mawonekedwe a kristalo umodzi, kuuma kwakukulu, kudzinola bwino, ndikupera ...
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