Kaolinite
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Kaolinite | |
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General | |
Category | Phyllosilicates Kaolinite-serpentine group |
Formula (repeatin unit) | Al2Si2O5(OH)4 |
Strunz clessification | 09.ED.05 |
Creestal seestem | Triclinic |
Space group | Triclinic pedial H-M seembol: (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 | |
Colour | White, sometimes reid, blue or broun tints frae impurities |
Creestal habit | Rarely as creestals, thin plates or stacked, Mair commonly as microscopic pseudohexagonal plates an clusters o plates, aggregatit intae compact, cleylik masses |
Cleavage | Perfect on {001} |
Tenacity | Flexible but inelastic |
Mohs scale haurdness | 2–2.5 |
Skinkle | Pearly tae dull yirdy |
Streak | White |
Speceefic 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 cley meeneral, pairt o the group o industrial meenerals, wi the chemical composeetion Al2Si2O5(OH)4.
References[eedit | eedit soorce]
- ↑ "Kaolinite mineral information and data". MinDat.org. Retrieved 2009-08-05.
- ↑ "Kaolinite Mineral Data". WebMineral.com. Retrieved 2009-08-05.
- ↑ Kaolinite in the Handbook of Mineralogy