Dims: 3.0 x 1.6 x 1.5" (7.7 x 4.0 x 3.9 cm)
Wt: 4.4 oz. (126 g)
Kingman Feldspar Mine, Mohave County, Arizona, U.S.A.
This large cabinet specimen consists primarily of a chunk of shapeless, relatively pure Allanite. It shows no crystal form and has the standard black color and bright pearly luster, although the material is streaked with mahogany-brown in some places. There is no evidence of any host rock. Analysis on the material shows the following rare-earth percentages, likely by weight: Ce=8.1%, La=4.4%, Nd=4.2%, Th=2.7%, Y=1.3%, Pr=1.0%, Sm=1.0%, Gd=0.7%.