Ukusila ilitye lonyawo luhlobo lwelitye lokuhlikihla unyawo elinokuthi lwenziwe ngeebhloko zepumice zendalo ezineenkcukacha ezahlukeneyo kunye neemilo.I-Grindstone inefuthe lokukhuthaza ukujikeleza kwegazi kweenyawo kunye nentliziyo yesibini enempilo yomzimba womntu.Kwangaxeshanye, inokususa ulusu oludala (olunzima) lweenyawo, ukhathalelo lwesikhumba kunye nobuhle, kwaye iqulethe intaphane yeeminerali eziluncedo kumzimba womntu, eyona mveliso ibalaseleyo yokhathalelo lwempilo kubantu abaphakathi nabadala.