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Hardystonite

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 Ca2ZnSi2O7

Hardystonite is known only from Franklin, New Jersey. It has never been found at Sterling Hill. It was found in moderate abundance at Franklin; masses of many kilograms weight were found.

hard 1uv.jpg (8194 bytes) hard 1day.jpg (3042 bytes)
Daylight view

Hardystonite and willemite fluorescing blue-violet and green, respectively, under short-wave UV. Franklin, NJ. Width 10 cm.

Hardystonite fluoresces a bright blue-violet color under short-wave ultraviolet light, though it is somewhat variable in both hue and intensity.

hard 2uv.jpg (9619 bytes) hard 2day.jpg (3467 bytes)
Daylight view

Hardystonite, calcite and willemite fluorescing blue-violet, reddish-orange and green, respectively, under short-wave UV. Franklin, NJ. Width 10 cm.

It is generally found with fluorescent calcite and willemite, and often with other fluorescent minerals as well. These specimens provide complex patterns and beautiful fluorescent textures that are unique to Franklin.

hard 3uv.jpg (15692 bytes)
Daylight view

Hardystonite, calcite and willemite fluorescing blue-violet, reddish-orange and green, respectively, under short-wave UV. Franklin, NJ. Width 10 cm.

Hardystonite is subject to alteration and replacement by other minerals. Dunn (1995) identifies esperite and clinohedrite, both of which are themselves brightly fluorescent.

hard 4uv.jpg (8696 bytes) hard 4day.jpg (3127 bytes)
Daylight view

Hardystonite, calcite and willemite fluorescing blue-violet, reddish-orange and green, respectively, under short-wave UV. Franklin, NJ. Width 8 cm.

The fluorescent response from many hardystonite specimens can be dull, and even in bright samples is usually overpowered by the associated willemite. However, it is a lovely fluorescent species - and unique to Franklin.

Be sure to visit the photo page taken under shortwave ultraviolet light.

For further information on hardystonite, see Dunn (1995).

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