Multiple oxide, samarskite group, approved in 2004
Specific gravity: 7.03
Hardness: 5 to 6
Streak: Brown to black
Common impurities: U,Th,Ca,Fe(II),Ta,Er,Y,Dy
Samarskite-(Yb) has been found to date (December 2020) only at its type locality.
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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