Kaolinite : CSIRO Spectroscopy Database

Kaolinite [ Al₂Si₂O₅(OH)₄ ]

Image of Kaolinite

Powder white kaolinite and calcite in a blue-grey Keokuk geode, from St. Francisville, Clark Co., Missouri, USA

Photo by John Krygier (http://www.mindat.org/user-13767.html#0), Public Domain

Material properties

Formula	Al₂Si₂O₅(OH)₄
Abbreviation	Kln
Variant	poorly crystalline
Classifications	Kaolinite (subgroup), Minerals containing OH
Luminescence emitters	M[n]OH, Si-O, Triplet-singlet, Unspecified, UO2
Spectra	Reflectance (1)
IMA Status	Approved (IMA 1980 s.p.)
Search other databases	webmineral.com, mindat.org, rruf.info, mineralienatlas.de, Handbook of Mineralogy, American Mineralogist Crystal Structure Database
Related materials	Dickite, Halloysite, Nacrite
Tags	Hydroxide, Hydroxide , Mineral, Aluminosilicate

Composition

Element	Atoms
O	9
Al	2
Si	2
H	4
Total:	17

References for Kaolinite

Bakhtin 1985

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Laukamp et al. 2021

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Gaft et al. 1996

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Pejcic et al. 2021 (EP2021-1148)

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Tarashchan 1978

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Specimens of Kaolinite

Name	Owner	Materials	Phase purity	Image	Spectra	Techniques
KGa1b Kaolinite	CSIRO	Anatase, Kaolinite (97.4%)	97.4	KGa1b Kaolinite Image of Kaolinite and Anatase in specimen 'KGa1b Kaolinite' [CSIRO], from Washington County, Georgia, USA. (C) 2025 CSIRO Mineral Resources. All rights reserved.	1	Reflectance
KGa2 Kaolinite	CSIRO	Anatase, Kaolinite (96.9%)	96.9	KGa2 Kaolinite Image of Kaolinite and Anatase in specimen 'KGa2 Kaolinite' [CSIRO]. (C) 2025 CSIRO Mineral Resources. All rights reserved.	0	—
APIH5 Kaolinite	CSIRO	Anatase, Kaolinite (96.4%)	96.4	APIH5 Kaolinite Image of Kaolinite and Anatase in specimen 'APIH5 Kaolinite' [CSIRO]. (C) 2025 CSIRO Mineral Resources. All rights reserved.	0	—
API13 Halloysite	CSIRO	Albite, Halloysite, Halloysite, hkl, Illite-Smectite 12.0A, Kaolinite (44.6%), Montmorillonite, Orthoclase, Quartz	44.6	API13 Halloysite Image of Kaolinite, Albite, Halloysite (var. hkl), Illite-Smectite 12.0A, Montmorillonite, Orthoclase and Quartz in specimen 'API13 Halloysite' [CSIRO]. (C) 2025 CSIRO Mineral Resources. All rights reserved.	0	—
PSP_E Eucryptite	CSIRO	Cookeite, Eucryptite, Kaolinite, poorly crystalline (14.0%), Pollucite, Quartz	14.0	PSP_E Eucryptite Image of Eucryptite, Cookeite, Kaolinite (var. poorly crystalline), Pollucite and Quartz in specimen 'PSP_E Eucryptite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	1	Reflectance
M2126 Sillimanite / Kaolinite	CSIRO	Boehmite, Kaolinite (11.1%), Sillimanite	11.1	M2126 Sillimanite / Kaolinite Image of Sillimanite, Boehmite and Kaolinite in specimen 'M2126 Sillimanite / Kaolinite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	0	—
130 Uvarovite	CSIRO	Chromite, Clinochlore, Kaolinite (6.9%), Lizardite-1T, Uvarovite	6.9	130 Uvarovite Image of Uvarovite on Chromite in specimen '130 Uvarovite' [CSIRO]. (C) 2025 CSIRO Mineral Resources. All rights reserved.	0	—
M1069 Alunite	CSIRO	Alunite, Andradite, Kaolinite (5.1%), Quartz	5.1	M1069 Alunite Image of Alunite, Andradite, Kaolinite and Quartz in specimen 'M1069 Alunite' [CSIRO], from Bulahdelah, Gloucester Co., Mid North Coast Region, NSW, Australia. (C) 2025 CSIRO Mineral Resources. All rights reserved.	0	—
M0762 Goethite	CSIRO	Goethite, Kaolinite (4.9%), Muscovite-1M, Muscovite-2M1, Orthoclase, Quartz	4.9	M0762 Goethite Image of Goethite, Kaolinite, Muscovite-1M, Muscovite-2M1, Orthoclase and Quartz in specimen 'M0762 Goethite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	0	—
MT8407 Meionite	CSIRO	Kaolinite (4.2%), Meionite, Montmorillonite, Muscovite-1M, Muscovite-2M1, Prehnite, Pumpellyite-(Mg), Cr, Scapolite	4.2	MT8407 Meionite Image of Scapolite, Kaolinite, Meionite, Montmorillonite, Muscovite-1M, Muscovite-2M1, Prehnite and Pumpellyite-(Mg) (var. Cr) in specimen 'MT8407 Meionite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	1	Reflectance
M2843 Eucryptite	CSIRO	Clinochlore, Fe, Cookeite, Eucryptite, Kaolinite, poorly crystalline (4.0%), Prehnite, Quartz	4.0	M2843 Eucryptite Image of Eucryptite, Clinochlore (var. Fe), Cookeite, Kaolinite (var. poorly crystalline), Prehnite and Quartz in specimen 'M2843 Eucryptite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	1	Reflectance
M0731 Magnetite	CSIRO	Hematite, Kaolinite (3.1%), Magnetite	3.1	M0731 Magnetite Image of Magnetite, Hematite and Kaolinite in specimen 'M0731 Magnetite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	0	—
SBCa-1 Montmorillonite / Quartz	CSIRO	Anatase, Kaolinite (3.1%), Montmorillonite, Quartz	3.1	SBCa-1 Montmorillonite / Quartz Image of Montmorillonite, Anatase, Kaolinite and Quartz in specimen 'SBCa-1 Montmorillonite / Quartz' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	0	—
M1850 Eucryptite	CSIRO	Clinochlore, Fe, Cookeite, Eucryptite, Kaolinite, poorly crystalline (3.0%), Quartz	3.0	M1850 Eucryptite Image of Eucryptite, Clinochlore (var. Fe), Cookeite, Kaolinite (var. poorly crystalline) and Quartz in specimen 'M1850 Eucryptite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	1	Reflectance
API H31 Illite	CSIRO	Anatase, Hematite, Illite, Illite-Smectite 12.0A, Kaolinite (2.9%), Quartz	2.9	API H31 Illite Image of Illite-Smectite 12.0A, Hematite, Kaolinite and Quartz in specimen 'API H31 Illite' [CSIRO]. (C) 2025 CSIRO Mineral Resources. All rights reserved.	0	—
M2729 Bornite / Muscovite	CSIRO	Bornite, Calcite, Cassiterite, Kaolinite (2.2%), Muscovite-2M1, Quartz, Siderite	2.2	M2729 Bornite / Muscovite Image of Bornite, Calcite, Cassiterite, Kaolinite, Muscovite-2M1, Quartz and Siderite in specimen 'M2729 Bornite / Muscovite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	0	—
MES001 Biotite / Phlogopite	CSIRO	Biotite-1M, Kaolinite (2.1%), Phlogopite-1M, Quartz	2.1	MES001 Biotite / Phlogopite Image of Biotite-1M, Kaolinite, Phlogopite-1M and Quartz in specimen 'MES001 Biotite / Phlogopite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	0	—
M0765 Goethite	CSIRO	Goethite, Kaolinite (1.3%), Quartz	1.3	M0765 Goethite Image of Goethite, Kaolinite and Quartz in specimen 'M0765 Goethite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	0	—
Erwan1 Biotite	CSIRO	Albite, Ca, Biotite, Biotite-1M, Kaolinite (1.0%), Quartz	1.0	Erwan1 Biotite Image of Biotite-1M, Albite (var. Ca), Kaolinite and Quartz in specimen 'Erwan1 Biotite' [CSIRO]. (C) 2025 CSIRO Mineral Resources. All rights reserved.	0	—