Fergusonite-(Y) on Allanite
$250.00
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From Wikipedia “Fergusonite is a mineral comprising a complex oxide of various rare-earth elements. The general chemical formula of fergusonite is (Y,REE)NbO4, where REE = rare-earth elements in solid solution with Y. Yttrium is usually dominant (the mineral in this case being referred to as fergusonite-(Y)), but sometimes Ce or Nd may be the major rare-earth component (in fergusonite-(Ce) and fergusonite-(Nd), respectively). The other rare-earth elements are present in smaller amounts, and tantalum sometimes substitutes for some of the niobium.”
This specimen is comprised of Fergusonite on Allanite. The Fergusonite presents as lustrous on the black allanite in two places (pictured). This specimen was in the Carter Rich, Joe Cilen and, finally the George Loud collections.
Locality: Little Friar Mountain, Northwest slope, Woodson, Amherst County, Virginia