A celestine geode with well-formed crystals standing proud of the cavity wall.
Worth knowing how soft this is before you find a spot for it. Celestine sits at 3 to 3.5 on the Mohs scale, below a copper coin, and it has perfect cleavage, so a knock does not scuff a crystal, it splits one cleanly.
It wants a shelf where it will not be picked up often or sat next to something harder.
Mineral: Celestine (celestite), strontium sulfate (SrSO₄)
Crystal system: Orthorhombic
Origin: Madagascar
Hardness: 3 to 3.5 on the Mohs scale; soft and brittle, with perfect cleavage
Treatment: None
Dimensions: 13.55 x 7.2 x 15.6 cm
Weight: 2.735 kg
Note: Soft at 3 to 3.5 on the Mohs scale, and it cleaves perfectly, so crystal tips chip easily. Lift it by the base rather than the crystals, keep it clear of harder specimens, and dust it with a soft dry brush rather than washing
You will receive the exact piece photographed.