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Mchenga wozungulira
Mchenga wa quartz wozungulira umapangidwa ndi quartz zachilengedwe pogaya.Ili ndi kuuma kwakukulu kwa Mohs, tinthu tating'ono tozungulira popanda ngodya yakuthwa ndi tinthu tating'onoting'ono, tinthu tating'onoting'ono topanda zonyansa, silicon yambiri komanso kukana moto.
