Large display specimen of nail head calcite spar found in Weardale, County Durham, UK, UK. Specimens are supplied in a white card tray with a information label. Calcite is a very common mineral with many different variations and colours, it is highly reactive with many acids including weaker ones and is quite low on the moh's scale of hardness 3. These specimens are nail head calcite a variety of calcite which has flat pyramidal termination of the prismatic crystals which resemble nail heads. Overall, the sample measures 120 x 85 x 40 mm in size, an excellent addition,moreso for its locality than anything else, especially for those you interested in British mineral pieces.