A particularly fine specimen of Butterfly twin habit Calcite from the Egremont Iron mining area in west Cumbria. A crystal displaying the twining form to great advantage, very lustrous colourless gemmy. Some black spotty inclusions of Goethite are seen at the peripheral edges of the specimen. One of the prismatic crystals of Calcite in contact association with the twin has been repaired/reinstated, very much reflected in the price for a great specimen.