Tisbury Starstone Freeform Cabochon | 4.2cm | UK Stellar Beam Calcite Hollandite is a fascinating and

Hollandite is a fascinating and rare manganese oxide mineral

this one-of-a-kind specimen captures the delicate structure of ancient flora in stunning opalised detail

where the surface catches light with an almost graphitic lustre

naturally resting on its side and showcasing dense crystallisation that adds texture

Safe to water cleanse: Not recommended

Tisbury Starstone Freeform Cabochon | 4.2cm | UK Stellar Beam Calcite Hollandite is a fascinating andTisbury Starstone Freeform Cabochon 4. 2cm UK A particularly interesting Tisbury Starstone cabochon from Wiltshire, UK, and one that rewards close looking. The shape is a tapering rectangle one edge wider than the other and the piece has been carved at a slight angle through the coral structure, which means the surface reveals both the classic circular star patterns and the fine feathering effect of the coral's radiating internal structure