Dolomite Pseudomorph After Calcite

Large platy crystals of Calcite have been completely replaced by creamy Dolomite, an uncommon specimen from the Bere Alston Mines, Devon. The original crystals of Calcite have grown in a stepped form in sub-parallel habit, the largest crystal measuring to 8cm. A crystal druse of rhombic Dolomite with a pearly lustre covers the surface of the 'Calcite' crystals and a scattered dusting of light brassy yellow pyrite is seen on the Dolomite. A colourless to slightly yellow Fluorite with Pyrite is the matrix for the pseudomorphed Calcite crystals. An uncommon specimen from the mines.