Dims: 4.0 x 3.2 x 3.1" (10.2 x 8.1 x 7.8 cm)
Wt: 1 lb., 10.0 oz. (737 g)
Franklin, New Jersey, U.S.A.
The massive Hardystonite in this cabinet specimen looks like a dull, pale-brown rock mixed in with a darker brown, mottled rock. Its classic dull violet fluorescence is easily visible, however, under shortwave ultraviolet light. Accompanying willemite also shows fluorescence, in the form of a bright green glow. There is also one tiny spot of clinohedrite, which fluoresces orange-yellow. Materials that do not glow are likely either made up of franklinite, with its black color and submetallic luster, or perhaps zincite, which ranges from yellow to brown.