Malachite and galena, four lumps. From Naqada Tomb 660. Identification of Galena confirmed by X-ray diffraction Dr. N.H. Gale, Department of Geology, University of Oxford, 1978. Lead Isotope result: 208pb/206pb 207pb/206pb 206pb/204pb 2.02621 0.82297 18.9276. Neutron Activation result: Cu. 240.49, Au..0598, As. 6.72, Sb. 38.82, Ag. 21.82.
- Baumgartel, Elise Jenny, Naqada supplement, p. XXVI - Petrie, William Matthew Flinders, Naqada and Ballas: 1895 - Gale, Noel H., Sources of Galena, Lead and Silver in Predynastic Egypt
