Keiviite-(Y)

keiviite-(Y)

kuliokite

xenotime

hingganite

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Formula: Y₂Si₂O₇
Sorosilicates (Si₂O₇ groups), thortveitite group
Crystal System: Monoclinic
Specific gravity: 4.45 measured, 4.48 calculated
Hardness: 4 to 5
Streak: White
Colour: Colourless, white, pink, brown
Environments

Pegmatites

Keiviite-(Y) occurs in amazonite pegmatites and in fissures in quartz and fluorite (Webmin, HOM).
Associated minerals include keiviite-(Yb), thalénite-(Y), xenotime, bastnäsite, kuliokite-(Y), quartz, and fluorite (HOM).

Localities

At the type locality is the Ploskaya Mountain, Western Keivy Massif, Keivy Mountains, Lovozersky District, Murmansk Oblast, Russia, keiviite-(Y) occurs in an amazonite-bearing granite pegmatite, and in fissures in quartz and fluorite, or on keiviite-(Yb) associated with thalénite-(Y), xenotime, bastnäsite and kuliokite-(Y) (Dana, AM 73.191-192).

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