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Sulfates and sulfur salts

Alunite

Also known as Calafatite, KAl3(SO4)2(OH)6

CAS 1302-91-6Formula H6Al3KO14S2Molar mass 414.21 g/molEC 894-687-1
GHS signal word: Danger. Pictograms: Serious health hazard
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Alunite chemical structure, H6Al3KO14S2, CAS 1302-91-6
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
1302-91-6
Formula
H6Al3KO14S2
Molar mass
414.21 g/mol
EC number
894-687-1
HS code
283330
Category
Sulfates and sulfur salts

What is Alunite?

Plain description, key identifiers and synonyms

Alunite is a chemical substance with the molecular formula H6Al3KO14S2 and a molar mass of 414.21 g/mol. Its CAS registry number is 1302-91-6. The IUPAC name is trialuminum, potassium, hexahydroxide, disulfate.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
trialuminum, potassium, hexahydroxide, disulfate
CAS number
1302-91-6
EC number
894-687-1
Molecular formula
H6Al3KO14S2
InChIKey
KPZTWMNLAFDTGF-UHFFFAOYSA-D
InChI
InChI=1S/3Al.K.2H2O4S.6H2O/c;;;;2*1-5(2,3)4;;;;;;/h;;;;2*(H2,1,2,3,4);6*1H2/q3*+3;+1;;;;;;;;/p-10
SMILES (canonical and isomeric)
[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[Al+3].[Al+3].[Al+3].[K+]

Synonyms

  • Calafatite
  • KAl3(SO4)2(OH)6

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
414.21 g/molcalc.
Exact mass
413.8282 Dacalc.
LogP (octanol/water)
-7.88calc.
Topological polar surface area
340.5 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
14calc.
Rotatable bonds
0calc.
Heavy atoms
20calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
12calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS08: Serious health hazard
Serious health hazard

Hazard statements

  • H372Causes damage to organs through prolonged or repeated exposure.
Precautionary statements (5)
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P319Get medical help if you feel unwell.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Alunite suppliers

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Alunite price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Industries and functions

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Alunite is traded under.

HS 2833.30Indicative HS code

Alums

World exports in 2024
$18.5M
+27.3% vs 2023, imports $25.2M
2019 to 2024
Top exporters
  1. China36.3%
  2. Mexico16.2%
  3. Germany7.7%
Top importers
  1. United States32.9%
  2. Thailand9.4%
  3. Japan8.7%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Alunite is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Alunite, based on the data on this page

What is Alunite?

Alunite is a chemical substance with the molecular formula H6Al3KO14S2 and a molar mass of 414.21 g/mol. Its CAS registry number is 1302-91-6. The IUPAC name is trialuminum, potassium, hexahydroxide, disulfate.

What is the CAS number of Alunite?

The CAS registry number of Alunite is 1302-91-6.

What is the molecular formula and weight of Alunite?

The molecular formula of Alunite is H6Al3KO14S2 and its molar mass is 414.21 g/mol.

What is Alunite used for?

Known uses and roles of Alunite include coagulants in water treatment.

Is Alunite hazardous?

Alunite carries the GHS signal word "Danger". Main hazards: causes damage to organs through prolonged or repeated exposure. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Alunite?

Alunite is usually classified under HS code 283330 (Alums). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Alunite?

Post a free request on CompoundList and suppliers of Alunite will send you quotes. Your contact details stay private until you accept a quote.

What is the price of Alunite?

Suppliers quote Alunite on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Alunite

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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