Helium (hcp phase)
allotrope
He
Theoretical
Solid helium in its hexagonal close-packed form — only exists under extreme pressure
← Allotrope of Helium
A crystalline allotrope of Helium (space group P 63/m m c), sourced from the Crystallography Open Database (COD 1512509).
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Crystallography
| Catalogue identity | Helium — P 63/m m c - P 63/m m c |
| Formula | He |
| Crystal system | hexagonal |
| Space group | P 63/m m c |
| Lattice (a, b, c) Å | 2.92661, 2.92661, 4.77913 |
| Angles (α, β, γ) ° | 90, 90, 120 |
| Density (g/cm³) | 0.4107676601651772 |
| Determination | Theoretical (computed) |
Structure data: Crystallography Open Database · Public domain (CC0)
