A textile fabric pseudomorph is a mineralized structure formed through a petrifaction process in which the organic compounds of fibers have been replaced by inorganic compounds while assuming the physical shapes of fibers, yarns, and fabrics. Photomicrographic analysis of a bronze halberd (Shang period, ca. 1300 BC) revealed multiple layers of mineralized fabric formations composed of the filament shapes characteristic of silk. X-ray diffraction, scanning electron microscopy, and energy dispersive analysis of x-rays were employed to identify the mineral composition of the pseudomorphs. A model for the process of silk pseudomorph formation on the bronze halberd is proposed, including solution, transport, and reaction of copper ions. See AATA 21-1449 for reference to book.