White Tremolite Jade Plaques from the Eastern Zhou – Early Warring States Period: Material Provenance, Iconography, and the Role of Local Jade Sources in the Rise of Mastery

Abstract This article presents four rectangular jade plaques attributed to the late Eastern Zhou – early Warring States period (ca. 5th–4th centuries BCE). The objects are carved from white tremolite nephrite with ochre-brown patina aligned along fibrous structures. Their iconography combines mask motifs, dragon-serpents, and scroll ornaments, demonstrating a high level of technical and symbolic sophistication. Mineralogical analysis and comparison with museum parallels support attribution to the Warring States period. Geological data suggest that the Xiaomeiling (Liyang, Jiangsu) deposit provided white tremolite jade with coarse fibrous bundles. The availability of such high-quality material likely facilitated the remarkable rise of craftsmanship during this period. Introduction The Eastern Zhou dynasty (770–256 BCE) and its late phase, the Warring States period (475–221 BCE), mark the culmination of jade carving traditions in ancient China. Rectangular jade plaques (玉牌 yu pai) with openwork ornamentation and zoomorphic motifs exemplify the mastery of artisans of this era (Cleveland Museum of Art 1971.92¹; Harvard Art Museums 1943.50.64²). While much scholarship has focused on typology and symbolism, less attention has been given to the material basis of craftsmanship. This study argues that the emergence of white tremolite nephrite from nearby geological sources provided the raw material that enabled artisans to achieve greater depth, complexity, and refinement in jade carving. Materials and Techniques The four plaques analyzed here share the following features: Material: white tremolite nephrite, with subtle yellowish zones and coarse fibrous bundles (He et al. 2002¹⁵; Li et al. 2021¹⁴). Patina: ochre-brown Fe-oxide infiltration, concentrated in recesses and along fibrous planes, indicating long-term burial (Bao et al. 2020). Carving: deep relief, openwork perforations, and linear abrasions consistent with rotary abrasive techniques of the Eastern Zhou (Cook 2013⁹). Surface: smoothed on raised areas, with calcified patina in depressions. Iconography and Ornament Plaque 1: Central mask with entwined dragons A rectangular plaque featuring a central mask-like figure framed by symmetrical serpent-dragons. The motif reflects the Zhou taotie tradition, here transformed into dynamic zoomorphic compositions comparable to plaques from the Cleveland Museum of Art (1970.148³). Plaque 2: Spiral-scroll ornament An arrangement of repeating S-shaped scrolls, continuing the decorative tradition of Shang and Zhou, but executed with greater depth and fluidity (British Museum 1961,1214.2⁶). Plaque 3: Vertical axis composition A central column-like form flanked by spirals and paired figures. The motif suggests a ritual axis mundi, paralleling symbolic functions in Eastern Zhou ritual jades (Metropolitan Museum of Art 2005.270⁵). Plaque 4: Anthropomorphic winged figure An openwork design resembling a central anthropomorphic figure with outstretched wings, framed by serpent-like creatures. This recalls symbolic mediators between heaven and earth, comparable to Harvard Art Museums plaques with intertwined animals (Harvard 298999⁴). Geological Aspect: The Source of White Nephrite The fibrous structure, whiteness, and patina of the plaques match descriptions of tremolite nephrite from the Xiaomeiling (Liyang, Jiangsu) deposit (He et al. 2002¹⁵; Li et al. 2021¹⁴). This deposit produces large blocks of white to grey-white nephrite with coarse fibrous bundles, ideal for deep carving. Proximity (~100–170 km) to centers of Eastern Zhou activity and access via the Taihu–Yangtze water system made this source strategically significant. The availability of such stone likely explains the technological and artistic leap visible in Warring States jade carving. Cultural Significance Jade plaques were insignia of aristocratic rank, often sewn onto garments or used as ritual emblems. The motifs of dragons, masks, and scrolls embody cosmological mediation: Dragon-serpents as liminal beings connecting water and heaven (British Museum 1945,1017.7⁷). Scrolls as symbols of continuity and cyclical order (Salviati 2017¹¹). Masks as protective and ancestral motifs. The integration of these motifs into white nephrite plaques demonstrates both technical mastery and symbolic synthesis, enabled by reliable access to high-quality stone. Conclusion The four plaques analyzed here are authentic Eastern Zhou–Warring States jade objects carved from white tremolite nephrite. Their iconography reflects cosmological and political symbolism, while their material and workmanship point to Xiaomeiling (Liyang, Jiangsu) as the geological source. The availability of large blocks of white nephrite directly influenced the development of jade artistry, enabling deeper carving, more complex compositions, and refined symbolism. This case study demonstrates the direct connection between geology and cultural florescence in Chinese antiquity. References Cleveland Museum of Art. Plaque with Openwork Interlaced Dragons and Birds. Eastern Zhou dynasty, Warring States period (475–221 BCE). Jade (nephrite). Cleveland Museum of Art, accession no. 1971.92. https://www.clevelandart.org/art/1971.92. Harvard Art Museums. Jade Openwork Plaque Terminating in Dragon Heads. China, Eastern Zhou dynasty, Warring States period (475–221 BCE) or Western Han (206 BCE–9 CE). Nephrite jade. Harvard Art Museums, object no. 1943.50.64. https://harvardartmuseums.org/collections/object/299000. Cleveland Museum of Art. Pair of Jade Plaques. Eastern Zhou dynasty (770–256 BCE). Jade (nephrite). Cleveland Museum of Art, accession no. 1970.148. https://www.clevelandart.org/art/1970.148. Harvard Art Museums. Openwork Plaque of Intertwined Animals and Birds. Eastern Zhou dynasty, Warring States period. Nephrite jade. https://harvardartmuseums.org/collections/object/298999. The Metropolitan Museum of Art. Plaque with incised designs. Eastern Zhou dynasty (5th century BCE). Jade (nephrite). Accession no. 2005.270. https://www.metmuseum.org/art/collection/search/49418. British Museum. Bi disc with low-relief C-scrolls. Warring States period (475–221 BCE). Nephrite jade. Museum no. 1961,1214.2. https://www.britishmuseum.org/collection/object/A_1961-1214-2. British Museum. Dragon-bird huang pendant. Warring States period (475–221 BCE). Museum no. 1945,1017.7. https://www.britishmuseum.org/collection/object/A_1945-1017-7. British Museum. Plaque with animals in combat. Warring States period to early Han dynasty. Nephrite jade. https://www.britishmuseum.org/collection/object/A_1957-1214-1. Cook, F.A. “Raised relief on nephrite jade artifacts.” Journal of the American Oriental Society 133, no. 1 (2013): 1–22. Smithsonian Institution (Freer | Sackler / NMAA). Chinese Art of the Warring States Period: Change and Continuity (480–222 BCE). Exhibition catalogue. Washington, DC: Smithsonian Institution, 1990. Salviati, F. 4000 Years of Chinese Archaic Jades. Milan: Skira, 2017. National Palace Museum (Taipei). Jade in Chinese Culture: Eastern Zhou to Han. Taipei: NPM, 1990. Freer Gallery of Art (Smithsonian). Dragon Pendant with Even Scrolls. Warring States period, Changsha region (Chu). Nephrite jade. Li, P., Wang, H., Zhao, J., et al. “Spectroscopic characteristics of nephrite from Xiaomeiling deposit, Liyang, Jiangsu Province, China.” Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 263 (2021): 120200. He, M.Y., Zhu, Y.N., Li, H.B. “Gemmological characteristics of Meiling jade from Liyang, Jiangsu Province.” Acta Petrologica et Mineralogica 21, Supplement (2002): 99–104. Appendix: Evidence and References for Attribution (Full List, Without Abbreviation) Cleveland Museum of Art.Plaque with Openwork Interlaced Dragons and Birds. Eastern Zhou dynasty, Warring States period (475–221 BCE). Jade (nephrite). Cleveland Museum of Art, accession no. 1971.92.Description: Rectangular plaque with openwork carving. Interlaced dragons and birds form a symmetrical design. Motifs and the technique of deep relief carving are directly comparable to the four plaques analyzed here.https://www.clevelandart.org/art/1971.92 Cleveland Museum of Art.Pair of Jade Plaques. Eastern Zhou dynasty (770–256 BCE). Jade (nephrite). Cleveland Museum of Art, accession no. 1970.148.Description: Two plaques with fantastic animals executed in openwork technique. The craftsmanship confirms the high level of jade carving during the Eastern Zhou.https://www.clevelandart.org/art/1970.148 Harvard Art Museums.Jade Openwork Plaque Terminating in Dragon Heads. China, Eastern Zhou dynasty, Warring States period (475–221 BCE) or Western Han (206 BCE–9 CE). Nephrite jade. Harvard Art Museums, object no. 1943.50.64.Description: Openwork carving with terminal forms in the shape of dragon heads. A close analogue in technique and theme.https://harvardartmuseums.org/collections/object/299000 Harvard Art Museums.Openwork Plaque of Intertwined Animals and Birds. Eastern Zhou dynasty, Warring States period. Nephrite jade.Description: A plaque of light nephrite, ornamented with intertwined animal and bird figures. Compositionally comparable to the studied plaques.https://harvardartmuseums.org/collections/object/298999 The Metropolitan Museum of Art.Plaque with incised designs. Eastern Zhou dynasty (5th century BCE). Jade (nephrite). Accession no. 2005.270.Description: Rectangular plaque with surface incised designs. Important as a museum standard for dating and stylistic comparison.https://www.metmuseum.org/art/collection/search/49418 British Museum.Bi disc with low-relief C-scrolls. Warring States period (475–221 BCE). Nephrite jade. Museum no. 1961,1214.2.Description: Although a disc rather than a plaque, its ornamental C-scrolls are identical to motifs on the studied plaques, confirming the stylistic