Biotite (dub mica)
cov khoom piav qhia
Ib leeg siv lead ua ntawm biotite yog luv columnar thiab phaj-puab, nrog hexagonal hla ntu thiab scaly aggregate.Xim av los yog dub.Cov xim yuav tsaus dua nrog qhov nce ntawm cov ntsiab lus hlau.Lwm cov khoom siv kho qhov muag thiab cov khoom siv kho qhov muag zoo ib yam li cov muscovite, nrog cov txheeb ze ntawm 2.7-3.3.
Sau koj cov lus ntawm no thiab xa tuaj rau peb