A beautiful display specimen of a scalenohedron calcite crystal bed from Avon, Bristol, UK. Calcite is one of the polymorphs of calcium carbonate, the others being aragonite and vaterite. Calcite is one of the index minerals in the Mohs scale at number 3, as it is a fairly soft mineral, able to be scratched by your finger nail. The calcite of this specimen has formed as scalenohedron crystals some of which are double terminated, the piece also showcases several beautiful pyrite phantoms. Crystal phantoms occur when a mineral ceases to grow and is coated in small crystals of either the same mineral or a different species, the original crystal then continues its growth trapping the smaller crystals within and creating the effect known as phantomed crystals. This sample is a magnificent piece and a must have for any British mineral collector. The specimen weighs roughly 3.232 kg and measures approximately 20 x 14.5 x 12 cm, it comes supplied with an information label.