Dims: 3.0 x 2.9 x 2.2" (7.5 x 7.3 x 5.5 cm)
Wt: 15.1 oz. (429 g)
Franklin, New Jersey, U.S.A.
Under normal light, it is not easy to discern the Hardystonite from the calcite and very difficult to discern it from the willemite on this cabinet specimen. However, when bathed in shortwave ultraviolet light, one can easily discern the dull violet fluorescent color of the Hardystonite as compared to the respective bright red and green colors of the calcite and willemite. This material is massive, showing no crystal form, and has a dull white color under white light and a dull, waxy luster at best. Accompanying it and the two other fluorescent minerals are scores of black franklinite crystals, many of which are broken. The franklinites are distinctive in that they do not fluoresce.