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.
.
   
Inosilicates, Neosilicates, Sorosilicates
    
   
Oxides, Hydroxides,
Carbonates
Silicates
          
min min
Name: Plagioclase Feldspar
Alternate Speciment(s)
Fichter, Lynn S.
James Madison University
Class: SILICATES Group: Tektosilicates (framework silicates)
Color
white, gray, or black
Chemical Formula: NaCaAlSi3O8
Streak
white
Luster
glassy
Hardness
6
Cleavage
2 directions at almost 90°
Density
2.6 - 2.8
Crystal Form
Triclinic
Common Uses / Other Facts: Used in the porcelain industry. Composition ranges from NaAlSi3O8 (Albite) to CaAl2Si2O8 (Anorthite).
rock
Sulfides and Sulfates
Halides
Organic
min