Hardystonite
Hardystonite is named after its discovery locality, the North Hill mine, Franklin, Hardyston Township, Sussex County, New Jersey, USA.
Hardystonite appears white to gray to light pink in colour in daylight, sometimes with a vitreous or greasy lustre. But under Short Wave Ultraviolet (254 nm wavelength) light, emits a fluorescence from dark purple to bright violet blue. Usually occurs in coarse, columnar masses, well formed crystals are very rare.
Hardystonite appears white to gray to light pink in colour in daylight, sometimes with a vitreous or greasy lustre. But under Short Wave Ultraviolet (254 nm wavelength) light, emits a fluorescence from dark purple to bright violet blue. Usually occurs in coarse, columnar masses, well formed crystals are very rare.
| General Information | ||||||||||||||
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| Chemical Formula |
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| Physical Properties of Hardystonite | ||||||||||||||
| Mohs Hardness | 3 to 4, Handbook of mineralogy (2001) | |||||||||||||
| Specific Gravity | 3.396 to 3.443, Handbook of mineralogy (2001) | |||||||||||||
| Tenacity | Brittle, Handbook of mineralogy (2001) | |||||||||||||
| Cleavage Quality | Good,Poor, Handbook of mineralogy (2001) | |||||||||||||
| Optical Properties of Hardystonite | ||||||||||||||
| Optical Character | Uniaxial/-, Handbook of mineralogy (2001) | |||||||||||||
| Colour | ||||||||||||||
| Colour (General) | White, pinkish, light brown; colorless in thin section., Handbook of mineralogy (2001) | |||||||||||||
| Transparency | Translucent, Handbook of mineralogy (2001) | |||||||||||||
| Lustre | Vitreous, Handbook of mineralogy (2001) | |||||||||||||
| Fluorescence & other light emissions | ||||||||||||||
| Fluorescence (General) | A dull violet fluorescence can be observed in some samples under UV., Handbook of mineralogy (2001) | |||||||||||||
| Crystallography of Hardystonite | ||||||||||||||
| Crystal System | Tetragonal, Handbook of mineralogy (2001) | |||||||||||||
| Habit | In coarse, columnar masses; granular and as isolated grains., Handbook of mineralogy (2001) | |||||||||||||
| Geological Environment | ||||||||||||||
| Where found: | In granular ore in a metamorphosed stratiform zinc deposit., Handbook of mineralogy (2001) | |||||||||||||
| Further Information | ||||||||||||||
| Mineral information: | Hardystonite information at mindat.org | |||||||||||||