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

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	—
API H5 Kaolinite	CSIRO	Anatase, Kaolinite (96.4%)	96.4	API H5 Kaolinite Image of Kaolinite and Anatase in specimen 'APIH5 Kaolinite' [CSIRO]. (C) 2025 CSIRO Mineral Resources. All rights reserved.	0	—
APIH13 Halloysite	CSIRO	Albite, Halloysite, Halloysite (var. hkl), Illite-Smectite 12.0A, Kaolinite (44.6%), Montmorillonite, Orthoclase, Quartz	44.6	APIH13 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 (var. 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	CSIRO	Boehmite, Kaolinite (11.1%), Sillimanite	11.1	M2126 Sillimanite Image of Sillimanite with Boehmite and Kaolinite in specimen 'M2126 Sillimanite' [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, Muscovite-1M, Muscovite-2M1, Prehnite, Pumpellyite-(Mg) (var. Cr), Scapolite (group)	4.2	MT8407 Meionite Image of specimen 'MT8407 Meionite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	1	Reflectance
M2843 Eucryptite	CSIRO	Clinochlore (var. Fe), Cookeite, Eucryptite, Kaolinite (var. 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 Beidellite	CSIRO	Anatase, Beidellite, Kaolinite (3.1%), Montmorillonite, Quartz	3.1	SBCa-1 Beidellite Image of Montmorillonite, Anatase, Kaolinite and Quartz in specimen 'SBCa-1 Beidellite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	0	—
M1850 Eucryptite	CSIRO	Clinochlore (var. Fe), Cookeite, Eucryptite, Kaolinite (var. poorly crystalline) (3.0%), Quartz	3.0	M1850 Eucryptite Image of specimen 'M1850 Eucryptite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	1	Reflectance
API H31 Smectite	CSIRO	Anatase, Hematite, Illite-Smectite 12.0A, Kaolinite (2.9%), Quartz, Smectite (group)	2.9	API H31 Smectite 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	CSIRO	Bornite, Calcite, Cassiterite, Kaolinite (2.2%), Muscovite-2M1, Quartz, Siderite	2.2	M2729 Bornite Image of specimen 'M2729 Bornite' [CSIRO]. (C) 2026 CSIRO Mineral Resources. All rights reserved.	0	—
MES001 Biotite	CSIRO	Biotite, Biotite-1M, Kaolinite (2.1%), Phlogopite-1M, Quartz	2.1	MES001 Biotite Image of Biotite, Kaolinite, Phlogopite and Quartz in specimen 'MES001 Biotite' [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 (var. 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	—