Cobalt(II) Chloride
compound
CoCl2
The humidity-sensitive salt famous for changing colour from blue to pink
This crystal turns from vivid blue to pink as it absorbs water — a classic colour-change reaction every chemistry student knows.
Material
Gallery canvas set in a solid wood floating frame.
Frame
Brown
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Shown true-to-size - a 8×10in piece scaled against real furniture.
Crystallography
| Catalogue identity | Cobalt(II) chloride — R-3m |
| Formula | CoCl2 |
| Crystal system | trigonal |
| Space group | R -3 m :R |
| Lattice (a, b, c) Å | 6.16, 6.16, 6.16 |
| Angles (α, β, γ) ° | 33.43, 33.43, 33.43 |
| Density (g/cm³) | 3.413 |
Structure data: Crystallography Open Database · Public domain (CC0)