A smashing specimen of Fluorite from the Allenheads Mine, Northumberland. The Fluorite forms sharp cubic crystals to 2.5cm on edge densely intergrown on the specimen. The Fluorite crystals have the characteristic translucent frosty lilac centres with gemmy purple edges and corners. Tiny transparent crystals of Quartz preferentially coat some of the Fluorite crystal faces like a sugary crust, while a biscuit coloured micro-crystal druse of Siderite has formed between the crystals of Fluorite. A black complex crystal of Sphalerite is seen at one end of the specimen. The underside of the specimen is covered by drusy Siderite with scattered black micro-crystals of Sphalerite, and colourless Fluorites. The minerals have all developed around a plate of Limestone. A very presentable and attractive specimen of Fluorite that probably came out of the replacement orebody associated with the Diana Vein in the 1970s.