The black, tabular grains of allanite in this specimen are 4-7 mm long and lie embedded in coarse-grained feldspar, probably microcline. This is the typical form of allanite from Franklin; numerous examples exist. The allanite grains upon close inspection show a well-developed pattern of radial cracks indicative of lattice expansion upon metamictization. The green mineral is epidote, a hydrothermal alteration product of the feldspar. Steven Phillips collection; formerly in the Lee Areson (LA966) and Gary Grenier (GG 797) collections.
Identifier: ALL2a Locality: Franklin (area) Specimen size: 10 x 6 x 1 cm Photo credit: Earl R. Verbeek
