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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.
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Daylight view |
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Hardystonite and
willemite fluorescing blue-violet and green, respectively, under short-wave UV. Franklin,
NJ. Width 10 cm.
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Hardystonite fluoresces a bright blue-violet
color under short-wave ultraviolet light, though it is somewhat variable in both hue and
intensity.
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Daylight view |
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Hardystonite,
calcite and willemite fluorescing blue-violet, reddish-orange and green, respectively,
under short-wave UV. Franklin, NJ. Width 10 cm.
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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.
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Daylight view |
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Hardystonite,
calcite and willemite fluorescing blue-violet, reddish-orange and green, respectively,
under short-wave UV. Franklin, NJ. Width 10 cm.
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Hardystonite is subject to alteration and
replacement by other minerals. Dunn (1995) identifies
esperite and clinohedrite, both of
which are themselves brightly fluorescent.
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Daylight view |
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Hardystonite,
calcite and willemite fluorescing blue-violet, reddish-orange and green, respectively,
under short-wave UV. Franklin, NJ. Width 8 cm.
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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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