White and pale tan crystal aggregates of keiviite-(Yb) — Photo: David Hospital · CC BY 4.0
Keiviite-(Yb)
Keiviite-(Yb) is an IMA-recognized mineral species in the silicate class, with the chemical formula Yb₂Si₂O₇.
It crystallizes in the monoclinic crystal system (space group A2/m). It is a member of the Thortveitite structural group.
Key properties: specific gravity 5.95; Vitreous luster; optically biaxial.
IMA symbol Kvi-Yb, IMA status: approved, named in 1982.
Found in microcline-bearing pegmatites; two generations of the mineral are present.
It is found associated with Fluorite, bastnÄasite, hingganite, wulfenite.
The name refers to Keivy on the Kola Peninsula, Russia, and ytterbium in its composition.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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