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Dominant species
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Kaolinite
Chemical
Formula
Al2Si2O5(OH)4
Species
Silicates
Crystal
System
Triclinic
Mohs
Scale
2
Specific
Gravity
2.16-2.68
Color
White, sometimes red, blue or brown tints from impurities
Streak
White
Luster
Waxy, Pearly, Dull, Earthy
Refractive
Index
n = 1.553 - 1.563 n = 1.559 - 1.569 n = 1.560 - 1.570
Diaphaneity
Translucent, Opaque
Cleavage
Perfecton .
Fracture
Sub-Conchoidal
Crystal Habit:Rarely as crystals, thin platy or stacked, More commonly as microscopic pseudohexagonal plates and clusters of plates, aggregated into compact, claylike masses
Geological Setting:A primary constiuent of clay beds formed by the decomposition of feldspar-bearing rocks.
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