Ritual Jade Boar Figure in Black Nephrite: Morphology, Surface Mineralization, and Attribution to the Northeastern Chinese Neolithic (Late Hongshan–Early Xiajiadian I)

Author: Professor Nona Dronova, DScORCID: https://orcid.org/0009-0007-4867-9074Catalog No.: LZ-JADE-ZA-02License: Text — CC BY 4.0; Images — CC BY-SA 4.0Date: August 31, 2025 Abstract This study introduces a rare black nephrite zoomorphic sculpture interpreted as a recumbent boar. Analytical approaches included macromorphological examination, tool-mark analysis, and scanning electron microscopy (SEM) with energy-dispersive spectroscopy (EDS) of surface micro-samples. Results demonstrate natural calcitic crust (CaCO₃), Fe–Mn oxide inclusions within recesses, and patination patterns consistent with long-term burial. No evidence of modern tool use or chemical surface alteration was detected. The morphological canon—recumbent pose, through-window between forelegs, incised claws, stylized snout and ears—closely corresponds to northern Neolithic jade idioms. Comparative evidence links the object to the Late Hongshan–Early Xiajiadian I tradition (ca. 2500–1800 BCE). The figure is interpreted as a ritual totem embodying fertility and earth-related power. Keywords: jade, Hongshan, Xiajiadian I, Chinese Neolithic, zoomorphic sculpture, boar, pig-dragon, calcitic crust, SEM, surface alteration. 1. Introduction Zoomorphic jade sculptures of Northeastern China form a distinctive branch of Neolithic ritual material culture. Among them, pig and boar motifs—sometimes transformed into the so-called pig-dragons (zhulong)—occupied a special role as fertility symbols and protective totems. While pig motifs are better documented in small pendants and ornaments, freestanding sculptures of substantial size are rare. The present study analyzes a unique black nephrite boar figure and argues for its attribution to the Late Hongshan–Early Xiajiadian I cultural horizon. 2. Materials and Methods Object: black nephrite sculpture representing a boar/pig, tremolite-group nephrite. Dimensions: to be specified (length × width × height, mm). Documentation: high-resolution photography in profile and 3/4 views; macro-imaging of claws, patina, and perforated zone. Surface study: scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) applied to micro-particles detached from natural surface recesses. Tool-mark study: microscopic examination of carved lines, claw incisions, and polishing traces. 3. Morphological Description The object represents a recumbent animal with a compact body and stable base. Head: elongated snout, folded ears, shallowly modelled eyes, and incised nostrils and mouth. Forelegs: separated by a through-rectangular window, interpreted as a ritual or symbolic device. Claws: parallel incised grooves, rounded by wear, consistent with hand-carving and long-term aging. Surface finish: low-level polishing, hand-executed carving, absence of modern high-speed tool marks. 4. SEM/EDS Results Calcitic crust (CaCO₃): irregular whitish films and granular deposits, thicker within cavities, consistent with burial alteration. Iron and manganese oxides: localized brown to dark deposits concentrated in recesses and micro-fractures. Micro-relief: presence of irregular “dermatoglyphic” textures formed through mineral migration and long-term weathering. No modern intervention: absence of parallel high-speed rotary marks or acid polishing traces confirms authenticity of surface alteration. 5. Comparative Analysis Iconography: The pig/boar motif is well attested within the Hongshan tradition, notably in pig-dragons (zhulong) and freestanding zoomorphs. Parallels: The British Museum houses a Hongshan pig-dragon (c. 3500 BCE) exemplifying the northeastern pig iconography. Comparable zoomorphic sculptures with massive bodies and claw incisions are preserved in the Liaoning Provincial Museum. Liangzhu distinction: While pigs were central to Lower Yangtze economies and rituals, Liangzhu jades are dominated by bi, cong, and monster masks, with very few free-standing boar figures. Morphology of the present object fits more convincingly into the Northeastern tradition. 6. Interpretation The boar was associated with agricultural fertility, perseverance, and protective power in Chinese Neolithic cultures. This sculpture may have served as a totemic embodiment of earth-related spiritual forces, possibly used in funerary or communal rituals. Its substantial form, stability, and symbolic perforations underline its sacral character rather than ornamental use. 7. Conclusion The black nephrite boar figure represents a rare example of Northeastern Chinese Neolithic zoomorphic sculpture. Morphological analysis, surface mineralization patterns, and comparative parallels support an attribution to the Late Hongshan–Early Xiajiadian I horizon (ca. 2500–1800 BCE). The object exemplifies the ritual role of animal representations in early jade traditions and enriches our understanding of Neolithic symbolic systems. Figures Fig. 1. Ritual Jade Boar Figure, 3/4 view. Black nephrite with calcitic encrustation and incised claws. Fig. 2. Ritual Jade Boar Figure, profile view. Patination and Fe–Mn oxide staining visible on the surface. (High-resolution images to be uploaded as supplementary files.) References British Museum. Hongshan Pig-dragon, collection database entry. Larrivé-Bass, S. (2023). Jade for Bones in Hongshan Craftsmanship. Arts, 12(6). Bao, Y. et al. (2020). Raman spectroscopic study of alterations in ancient jade artifacts from Jinsha, China. Journal of Raman Spectroscopy. Wang, J. et al. (2025). Early domestication of pigs in the Lower Yangtze and ritual contexts. PNAS. Lander, B. (2020). A History of Pigs in China: Ritual and Domestication. Routledge. Recent conservation studies on calcitic crust and Fe–Mn alterations in ancient jades (Nature Materials, 2023).