The Rocks & Minerals Challenge Game
 
Mineral Identification by Picture and Attribute
Explorers! Before you begin your journey, you need to recognize these geological specimens.
 
Begin by selecting one of the specimens pictured.
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Inosilicates, Neosilicates, Sorosilicates
   
   
Oxides, Hydroxides,
Carbonates
Silicates
         
min min
Name: Biotite
Alternate Specimen(s)
Fichter, Lynn S.
James Madison University
Class: SILICATES Subclass: Phylosilicates (sheet silicates)
Color
black - brown
Chemical Formula: K(Mg, Fe+2)3(Al, Fe+3) Si3O10(OH, F)2
Streak
gray - brown
Luster
glassy
Hardness
2.5 - 3
Cleavage
1 direction, perfect
Density
2.8 - 3.4
Crystal Form
Monoclinic
Common Uses / Other Facts:
rock
Sulfides and Sulfates
Halides
Organic
min