Cov ntshav daj sharzite

Raws li ib qho ntawm cov kev tshaj lij bripple quartzite thiab cov muag khoom hauv Suav teb, peb tau nthuav tawm los ntawm cov khoom lag luam zoo thiab cov kev pabcuam zoo. Thov so assured mus yuav siab - bi} bad doog ntshav quartzite sis tus nqi sib tw los ntawm peb lub hoobkas.