Hellandite

hellandite

hellandite-(Ce)

hellandite-(Y)

inosilicate

Images

Formulae:
Hellandite-(Ce): (Ca,REE)₄Ce₂Al☐₂(B₄Si₄O₂₂)(OH)₂
Hellandite-(Y): (Ca,REE)₄Y₂Al☐₂(B₄Si₄O₂₂)(OH)₂
Inosilicates (chain silicates)

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