Keiviite

keiviite

keiviite-(Y)

keiviite-(Yb)

thortveitite

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Formulae:
keiviite-(Y): Y₂Si₂O₇
keiviite-(Yb): Yb₂Si₂O₇
Both are sorosilicates (Si₂O₇ groups), thortveitite group
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