Hellandite Group

hellandite-(Ce)

hellandite-(Y)

tadzhikite-(Ce)

The hellandite group includes:

hellandite-(Ce): (Ca,REE)4Ce2Al☐2(B4Si4O22)(OH)2
hellandite-(Y): (Ca,REE)4Y2Al☐2(B4Si4O22)(OH)2
tadzhikite-(Ce): Ca4Ce2Ti◻(B4Si4O22)(OH)2

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