Vote for your favorite mineral in #MinCup26! - Quartz vs. Asagiite
It's a classic vs a newbie as the most common named mineral in the crust Quartz is up against an exceedingly-rare sea foam-green mineral discovered just a few years ago Asagiite.
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Sericite from
Guocheng Au deposit (Tudui-Shawang Au deposit), Haiyang City, Yantai, Shandong, China


Locality type:Deposit
Classification
Species:Muscovite var: Sericite
Formula:KAl2(AlSi3O10)(OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Sericite data
Locality Data:Click here to view Guocheng Au deposit (Tudui-Shawang Au deposit), Haiyang City, Yantai, Shandong, China
Data Identifiers
Mindat Occurrence Record ID:1853993
Long-form Identifier:1:3:1853993:2
GUID (UUID V4):0
Localities for Sericite in this Region
Tudui section, Guocheng Au deposit (Tudui-Shawang Au deposit), Haiyang City, Yantai, Shandong, China
Nearest other occurrences of Sericite
4.5km (2.8 miles) ⓘLiaoshang Au deposit, Mouping District, Yantai, Shandong, China
5.2km (3.2 miles) ⓘXilaokou Au deposit, Rushan Co., Weihai, Shandong, China
10.8km (6.7 miles) ⓘPengjiakuang Mine, Rushan Co., Weihai, Shandong, China
12.2km (7.6 miles) ⓘLongkou Au deposit, Haiyang City, Yantai, Shandong, China
14.7km (9.1 miles) ⓘShangjiazhuang Mo deposit, Qixia City, Yantai, Shandong, China
22.2km (13.8 miles) ⓘSongjiagou Au deposit, Muping-Rushan metallogenic belt, Rushan Co., Weihai, Shandong, China
24.8km (15.4 miles) ⓘBaishi Au deposit, Tangjiagou ore field, Rushan Co., Weihai, Shandong, China
30.2km (18.8 miles) ⓘTangjiagou Au deposit, Tangjiagou ore field, Rushan Co., Weihai, Shandong, China
30.2km (18.8 miles) ⓘMajiayao Au deposit, Qixia City, Yantai, Shandong, China
31.8km (19.8 miles) ⓘMoshan Au deposit, Muping-Rushan metallogenic belt, Rushan Co., Weihai, Shandong, China
References
Sun, Ning-Han; Cui, Tao; Zhou, Rong-Zhi; Li, Yu-Ying; Fu, Qiang; Qin, Lian-Yuan; Deng, Qian-Jie; Wei, Xu-Feng (2025) Genesis of High-Grade Gold Mineralization at the Guocheng Deposit, Jiaodong Peninsula: Constraints from Magnetite Geochemistry. Minerals, 15 (12). doi:10.3390/min15121267
Zhang, Guoqing; Wang, Gongwen; Peng, Qingming; Liu, Kun; Chen, Yuchang; Cao, Yi (2026) Drill-Core SWIR-Based 3D Alteration Modeling and Machine Learning for Gold Prospectivity Prediction at the Tudui–Shawang Gold Deposit, Jiaodong Peninsula. Minerals, 16 (8). doi:10.3390/min16080855
 
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