Pyromorphite, Pb5(PO4)3Cl is Lead Chloride Phosphate. One of the secondary lead minerals found in the oxidised zone of lead ore deposits. The hexagonal barrel shaped crystals can vary in shape from thin and elongate, to short and stubby. The colour may also vary, but usually pale green to deep green. This specimen is from Caldbeck in Cumbria, and is a disorganised mass of elongate, pale green crystals.