Kaolinite

Frae Wikipedia
Jump to navigation Jump to search
Kaolinite
KaoliniteUSGOV.jpg
General
CategoryPhyllosilicates
Kaolinite-serpentine group
Formula
(repeatin unit)
Al2Si2O5(OH)4
Strunz clessification09.ED.05
Creestal seestemTriclinic
Space groupTriclinic pedial
H-M seembol: (1)
Space group: P1
Unit cella = 5.13 Å, b = 8.89 Å, c = 7.25 Å; α = 90°, β = 104.5°, γ = 89.8°; Z = 2
Identification
ColourWhite, sometimes reid, blue or broun tints frae impurities
Creestal habitRarely as creestals, thin plates or stacked, Mair commonly as microscopic pseudohexagonal plates an clusters o plates, aggregatit intae compact, cleylik masses
CleavagePerfect on {001}
TenacityFlexible but inelastic
Mohs scale haurdness2–2.5
SkinklePearly tae dull yirdy
StreakWhite
Speceefic gravity2.16–2.68
Optical propertiesBiaxial (–)
Refractive indexnα = 1.553–1.565,
nβ = 1.559–1.569,
nγ = 1.569–1.570
2V angleMeasurt: 24° to 50°, Calculatit: 44°
References[1][2][3]

Kaolinite is a cley meeneral, pairt o the group o industrial meenerals, 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