Skip to main content
Chemistry LibreTexts

13.4B: Structures of the Elements

  • Page ID
    34137
  • Allotropes of boron

    Boron can be prepared in several crystalline and amorphous forms. The best known crystalline forms are α-rhombohedral, β-rhombohedral, and β-tetragonal. Under special circumstances, boron can form α-tetragonal, and γ-orthorhombic allotropes. Two amorphous forms, one a finely divided powder and the other a glassy solid, are also known and a further 14 allotropes have been reported.

    Allotropes of Boron

    B12
    icosahedral unit

    α-rhombohedral

    β-rhombohedral

    γ-orthorhombic
    high pressure form
    • Was this article helpful?