Franklin Mine, Franklin, Sussex Co., New Jersey

Type Location

7.6 x 4 x 3.7 cm
3 x 1.6 x 1.5 in

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Ca₂Zn[Si₂O₇], CaZn(SiO₄)·H₂O

Under SW UV, the Hardystonite fluoresces blue with a violet tint, the Herdite fluoresces a peachy orange color and the Willemite fluoresces green. The Hardystonite and Herdite do not fluoresces as vividly as the Willemite. The Herdite is an alteration of the Hardystonite. Note: in the first picture, along the top of the specimen, some of the blue coloration, especially toward the right, is likely reflected light.

Condition: Composed of massive material.

Flaws: Essentially massive material.

This mineral is also found in the following galleries: Minerals From New York, New Jersey and New England | Sorosilicates | Nesosilicates | Oxides and Hydroxides | Rare Minerals | Fluorescents | Minerals Priced Between 50 and 99 Dollars