Keiviite-(Yb)

keiviite-(Yb)

keiviite

bastnasite

hingganite

Images

Formula: Yb₂Si₂O₇
Sorosilicates (Si₂O₇ groups), thortveitite group
Crystal System: Monoclinic
Specific gravity: 5.95 measured, 5.99 calculated
Hardness: 4 to 5
Streak: White
Colour: Colourless
Environments

Pegmatites

Keiviite-(Yb) occurs in amazonite pegmatites, associated with fluorite, bastnäsite, hingganite and wulfenite (HOM).

Localities

At the type locality, Ploskaya Mountain, Western Keivy Massif, Keivy Mountains, Lovozersky District, Murmansk Oblast, Russia, keiviite-(Yb) occurs in an amazonite-bearing granite pegmatite.
Two generations of keiviite-(Yb) are present, associated with fluorite, bastnäsite and hingganite (Dana).

Back to Minerals