Chemical Formula :  K(Al,Cr)2(AlSi3O10)(OH)2 

Mohs Scale : 2.5

Crystal System : Monoclinic

Muscovite

 Chemical Formula : K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 

  Mohs Scale : 2.5 - 3

  Crystal System : Monoclinic

•  Lepidolite is the most abundant lithium-bearing mineral and is a secondary source of this metal. 

 Chemical Formula : KAl2(AlSi3O10)(F,OH)2 

  Mohs Scale : 2- 2.5 

  Crystal System : Monoclinic

Chemical Formula :  Mg3Si4O10(OH)2 

Mohs Scale : 1

Crystal System : Monoclinic or triclinic

Chemical Formula :  (Mg, Fe)3Si2O5OH4 

Mohs Scale : 3.5 - 4 

Crystal System : Monoclinic

From Turkey

From Eskişehir, Turkey.

Chemical Formula :  Mg4Si6O15(OH)2·6H2O 

Mohs Scale : 2

Crystal System : Orthorhombic

Chemical Formula : (Mg, Fe)3Si2O5OH4

  Mohs Scale : 3.5-4

  Crystal System : Monoclinic