Carbon (Fmmm polymorph)
A rare face-centred orthorhombic form of carbon from high-pressure research
← Allotrope of Carbon
A crystalline allotrope of Carbon (space group F m m m), sourced from the Crystallography Open Database (COD 9000046).
Material
Gallery canvas set in a solid wood floating frame.
Frame
White
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Shown true-to-size - a 8×10in piece scaled against real furniture.
Crystallography
| Catalogue identity | Carbon — Fmmm |
| Formula | C |
| Crystal system | orthorhombic |
| Space group | F m m m |
| Lattice (a, b, c) Å | 2.456, 4.254, 6.696 |
| Angles (α, β, γ) ° | 90, 90, 90 |
| Density (g/cm³) | 2.281 |
Structure data: Crystallography Open Database · Public domain (CC0)
Allotropes

Carbon — C c m m

Carbon — C m m a

Carbon — C m m m

Carbon — Fm-3

Carbon — I -4 3 d

Carbon — I a -3

Carbon — I m -3

Carbon — Immm

Carbon — P 42/m m c

Carbon — P 63 m c

Carbon — P 64 2 2

Carbon — P 6/m m m

Carbon — Pa-3

Carbon — P b a n :1

Carbon — P c c a

Carbon — Pnnm

Carbon — R -3 m :H

Carbon — R -3 m :R

Diamond

Graphite