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MINERALOGY

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Mineral: FERRIHELLANDITE-(Ce)
Name: Ferri-hellandite-(Ce) 
Formula: (Ca3Ce)Ce2Fe3+▢2B4Si4O22(OH)2
Crystal System: Monoclinic
Group: Hellandite group
IMA Number: 2020-085
References: MM 85 (2021); EJM 33 (2021), 203
Type Locality: Sagasen Quarry, Sagåsen, Porsgrunn, Vestfold og Telemark, Norway

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