Mica Photos       
Cochise College               
Photos of Minerals
Virtual Geology Museum      Hall of Minerals

Geology Home Page

Roger Weller, geology instructor

wellerr@cochise.edu     copyright 2008-R.Weller 

 
biotite book
Biotite is K(Mg,Fe)₃AlSi₃O₁₀(OH)₂
Biotite is also known as black mica.  It can be peeled off of a large crystal in thin layers but with
more difficulty than peeling muscovite (white mica).  Biotite does not have economic value because
it lacks the transparency and electrical insulating properties found in muscovite.
 

mica
Photo is copyright free for non-commercial educational uses.
Just credit photo to R.Weller/Cochise College.