Samarskite-(Yb)

minerals

samarskite-(Y)

zircon

columbite

Formula: YbNbO4
Multiple oxide, samarskite group, approved in 2004
Specific gravity: 7.03
Hardness: 5 to 6
Streak: Brown to black
Colour: Black
Common impurities: U,Th,Ca,Fe(II),Ta,Er,Y,Dy
RADIOACTIVE
Environments

Pegmatites

Samarskite-(Yb) has been found to date (December 2020) only at its type locality.

Localities

At the type locality, the Little Patsy pegmatite, South Platte Pegmatite Mining District, Jefferson county, Colorado, USA, samarskite-(Yb) is a late-stage replacement mineral at the contact between core and margin of a pegmatite. It occurs as anhedral metamict masses, up to tens of cms in size, intergrown with columbite-(Fe) and zircon. Other associated minerals include samarskite-(Y), monazite-(Ce) and ishikawaite (Mindat).

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