Hodgkinsonite
Hodgkinsonite is named after H.H. Hodgkinson, discoverer of the mineral at Franklin, Sussex County, New Jersey, USA in 1913.
Franklin Mine, New Jersey has been the only source of facet-quality rough. The stones have been small, the colours are bright pink and lavender.
Franklin Mine, New Jersey has been the only source of facet-quality rough. The stones have been small, the colours are bright pink and lavender.
Hodgkinsonite Gemstones by Colour
This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
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| General Information | ||||||||||||||||||
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| Chemical Formula |
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| Physical Properties of Hodgkinsonite | ||||||||||||||||||
| Mohs Hardness | 4.5 to 5, Gemstones (2009) | |||||||||||||||||
| Specific Gravity | 4.06 to 4.08, Gems, Sixth Edition (2006) More from other references | |||||||||||||||||
| Tenacity | Brittle, Gemstones (2009) | |||||||||||||||||
| Cleavage Quality | Perfect, Gems, Sixth Edition (2006) More from other references | |||||||||||||||||
| Fracture | Uneven, Gemstones (2009) | |||||||||||||||||
| Optical Properties of Hodgkinsonite | ||||||||||||||||||
| Refractive Index | 1.720 to 1.746, Gems, Sixth Edition (2006) More from other references | |||||||||||||||||
| Optical Character | Biaxial/-, Gems, Sixth Edition (2006) More from other references | |||||||||||||||||
| Birefringence | 0.026, Gems, Sixth Edition (2006) More from other references | |||||||||||||||||
| Pleochroism | Lavender and pale purple for transparent pink stones., Gems, Sixth Edition (2006) More from other references | |||||||||||||||||
| Dispersion | Moderate, Gemstones (2009) | |||||||||||||||||
| Colour | ||||||||||||||||||
| Colour (General) | Brown, black, lavender, orange, pink, purple, violet, Gemstones (2009) | |||||||||||||||||
| Transparency | Transparent, Gems, Sixth Edition (2006) More from other references | |||||||||||||||||
| Lustre | Vitreous, Gemstones (2009) | |||||||||||||||||
| Fluorescence & other light emissions | ||||||||||||||||||
| Fluorescence (Long-Wave UV) | Specimens may show a dull red fluorescence., Gems, Sixth Edition (2006) | |||||||||||||||||
| Crystallography of Hodgkinsonite | ||||||||||||||||||
| Crystal System | Monoclinic, Gems, Sixth Edition (2006) More from other references | |||||||||||||||||
| Habit | Stout prismatic crystals with steep pyramids or with dominating pyramids., Gems, Sixth Edition (2006) More from other references | |||||||||||||||||
| Geological Environment | ||||||||||||||||||
| Where found: | Occurs as seams in massive willemite-franklinite granular ore in a metamorphosed stratiform zinc deposit., Gems, Sixth Edition (2006) | |||||||||||||||||
| Spectrographic Data | ||||||||||||||||||
| Calculated Spectra: Click spectra for more information | Hodgkinsonite - Locality: Sterling Hill, New Jersey, USA | |||||||||||||||||
| Further Information | ||||||||||||||||||
| Mineral information: | Hodgkinsonite information at mindat.org | |||||||||||||||||
| Significant Gem Localities | ||||||||||||||||||
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