Alunite : CSIRO Spectroscopy Database

Alunite [ KAl₃(SO₄)₂(OH)₆ ]

Image of Alunite

Alunite, massive material (Pen for scale) - Mineral collection of Brigham Young University Department of Geology, Provo, Utah - BYU index 10-7015

Photo by Andrew Silver, US Geological Survey. Public Domain

Material properties

Formula	KAl₃(SO₄)₂(OH)₆
Abbreviation	Alu
Classifications	Minerals containing OH, Minerals containing SO4
Luminescence emitters	M[n]OH, Triplet-singlet
IMA Status	Approved/redefined (IMA 1987 s.p.)
Search other databases	webmineral.com, mindat.org, rruf.info, mineralienatlas.de, Handbook of Mineralogy, American Mineralogist Crystal Structure Database
Tags	Hydroxide , Mineral, Sulphate

Composition

Element	Atoms
H	6
K	1
Al	3
O	14
S	2
Total:	26

References for Alunite

Laukamp et al. 2021

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Tarashchan 1978

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Specimens of Alunite

Name	Owner	Materials	Phase purity	Image
M1069 Alunite	CSIRO	Alunite (85.4%), Andradite, Kaolinite, Quartz	85.4	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.