Kaolinite

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Kaolinite
KaoliniteUSGOV.jpg
General
Category Phyllosilicates
Kaolinite-serpentine group
Formula
(repeating unit)
Al2Si2O5(OH)4
Strunz classification 09.ED.05
Crystal symmetry Triclinic pedial
H-M symbol: (1)
Space group: P1
Unit cell a = 5.13 Å, b = 8.89 Å, c = 7.25 Å; α = 90°, β = 104.5°, γ = 89.8°; Z = 2
Identification
Color White, sometimes reid, blue or broun tints frae impurities
Crystal habit Rarely as crystals, thin plates or stacked, Mair commonly as microscopic pseudohexagonal plates an clusters of plates, aggregatit intae compact, claylik masses
Crystal seestem Triclinic
Cleavage Perfect on {001}
Tenacity Flexible but inelastic
Mohs scale hairdness 2–2.5
Luster Pearly tae dull yirdy
Streak White
Specific gravity 2.16–2.68
Optical properties Biaxial (–)
Refractive index nα = 1.553–1.565,
nβ = 1.559–1.569,
nγ = 1.569–1.570
2V angle Measurt: 24° to 50°, Calculatit: 44°
References [1][2][3]

Kaolinite is a clay mineral, pairt o the group o industrial minerals, wi the chemical composeetion Al2Si2O5(OH)4.

References[eedit | eedit soorce]

  1. "Kaolinite mineral information and data". MinDat.org. Retrieved 2009-08-05. 
  2. "Kaolinite Mineral Data". WebMineral.com. Retrieved 2009-08-05. 
  3. Kaolinite in the Handbook of Mineralogy