Aluminium dodecaboride

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| IUPACName = Aluminium dodecaboride

| OtherNames = AlB₁₂

|Section1={{Chembox Identifiers

| ChemSpiderID_Ref = {{chemspidercite|changed|chemspider}}

| ChemSpiderID =

| InChI=1S/Al.12B

| InChIKey = JXOOCQBAIRXOGG-UHFFFAOYSA-N

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| CASNo_Ref = {{cascite|correct|??}}

| CASNo = 12041-54-2

| PubChem = 6336895

| SMILES = [B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[Al]

| EINECS = 234-924-2

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|Section2={{Chembox Properties

| Formula = {{chem2|AlB12}}

| MolarMass = 156.714 g/mol{{RubberBible92nd|page=4.45}}

| Appearance = Yellow to black solid

| Density = 2.55 g/cm³

| MeltingPtC = 2070

| MeltingPt_ref =

| BoilingPt =

| Solubility = insoluble

| SolubleOther = soluble in hot nitric acid (decomposes),{{cite book|isbn=9783540443766|title=Springer Handbook of Condensed Matter and Materials Data|pages=1025|year=2005|editor1=Martienssen, Werner|editor2=Warlimont, Hans|publisher=Springer-Verlag|bibcode=2005shcm.book.....M|last1=Martienssen|first1=Werner|last2=Warlimont|first2=Hans}}
soluble in nitric acid (decomposes),Rebekoff Reeve, Martin (1991) [https://patents.google.com/patent/EP0130016B1/en Method of producing an aluminium boride]. EP 0130016 B1
soluble in sulfuric acid (decomposes)

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|Section3={{Chembox Structure

| CrystalStruct = Tetragonal (α-form)
Orthorhombic (β-form)

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|Section7={{Chembox Hazards

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Aluminium dodecaboride ({{chem2|AlB12}}) is a superhard chemical compound with 17% aluminium content by weight.

It is the hardest boride of the aluminium-boron system, which also includes {{chem2|AlB10}}, {{chem2|AlB4}}, Aluminium diboride and AlB.