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It's a showdown with rare earth elemental ore Monazite-(Ce) and index mineral Andalusite.
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Calcite from
Main pit, Bayan Obo deposit, Bayan Obo mining district, Baotou City, Inner Mongolia, China


Locality type:Pit
Classification
Species:Calcite
Formula:CaCO3
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Calcite data
Locality Data:Click here to view Main pit, Bayan Obo deposit, Bayan Obo mining district, Baotou City, Inner Mongolia, China
Data Identifiers
Mindat Occurrence Record ID:525362
Long-form Identifier:1:3:525362:3
GUID (UUID V4):0
Nearest other occurrences of Calcite
0.4km (0.3 miles) ⓘBayan Obo deposit, Bayan Obo mining district, Baotou City, Inner Mongolia, China
1.4km (0.9 miles) ⓘH9 litho-unit, Bayan Obo deposit, Bayan Obo mining district, Baotou City, Inner Mongolia, China
1.4km (0.9 miles) ⓘEast Mine, Bayan Obo deposit, Bayan Obo mining district, Baotou City, Inner Mongolia, China
4.2km (2.6 miles) ⓘSain Usu Au deposit (Saiwusu Au deposit), Darhan Muminggan United Banner (Da'erhan Maoming'an Lianheqi; Damaoqi), Baotou City, Inner Mongolia, China
4.5km (2.8 miles) ⓘEastern contact zone, Bayan Obo deposit, Bayan Obo mining district, Baotou City, Inner Mongolia, China
4.8km (3.0 miles) ⓘWu dyke, Dulahala, Bayan Obo mining district, Baotou City, Inner Mongolia, China
7.8km (4.8 miles) ⓘWest Mine, Bayan Obo deposit, Bayan Obo mining district, Baotou City, Inner Mongolia, China
53.5km (33.2 miles) ⓘLaoyanghao Au deposit, Guyang County, Baotou City, Inner Mongolia, China
60.0km (37.3 miles) ⓘHaoyaoerhudong Au deposit, Urad Middle Banner (Wulate Zhongqi), Bayannur City (Bayannao'er Prefecture), Inner Mongolia, China
60.9km (37.8 miles) ⓘChangshanhao Mine (CSH Mine), Urad Middle Banner (Wulate Zhongqi), Bayannur City (Bayannao'er Prefecture), Inner Mongolia, China
References
Smith, M.P., Henderson, P., and Campbell, L.S. (2000): Geochimica et Cosmochimica Acta 64(18), 3141-1360.
Sun, Qing; Li, Xian-Hua (2026) Niobium and heavy rare earth element mineralization in the Bayan Obo deposit, China: Insights from aeschynite mineralogy, geochemistry, and geochronology. Geoscience Frontiers, 17 (6). p.102405. doi:10.1016/j.gsf.2026.102405
 
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