Hurlbutite
Hurlbutite is named after Cornelius Searle Hurlbut, Jr. (1906– 2005), Professor of Mineralogy, Harvard University.
Hurlbutite forms stout transparent to translucent colourless to greenish white crystals. Some material from Newport, New Hampshire, USA has been fashioned into gems.
| General Information |
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| Chemical Formula | Michael O’Donoghue, Gems, Sixth Edition (2006) |
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| Physical Properties of Hurlbutite |
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| Mohs Hardness | 6Michael O’Donoghue, Gems, Sixth Edition (2006) |
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| Specific Gravity | 2.90Michael O’Donoghue, Gems, Sixth Edition (2006) |
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| Tenacity | BrittleAnthony et al, Handbook of mineralogy (2001) |
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| Fracture | ConchoidalAnthony et al, Handbook of mineralogy (2001) |
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| Optical Properties of Hurlbutite |
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| Refractive Index | 1.595 to 1.604Michael O’Donoghue, Gems, Sixth Edition (2006) |
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| Optical Character | Biaxial/-Michael O’Donoghue, Gems, Sixth Edition (2006) |
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| Birefringence | 0.009Michael O’Donoghue, Gems, Sixth Edition (2006) |
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| Colour |
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| Colour (General) | Colourless to greenish whiteMichael O’Donoghue, Gems, Sixth Edition (2006) |
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| Transparency | Transparent,TranslucentMichael O’Donoghue, Gems, Sixth Edition (2006) |
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| Lustre | Vitreous,GreasyAnthony et al, Handbook of mineralogy (2001) |
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| Crystallography of Hurlbutite |
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| Crystal System | MonoclinicMichael O’Donoghue, Gems, Sixth Edition (2006) |
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| Habit | Stout prismatic crystals, to 2.5 cm; as spheres with a radial fibrous structureAnthony et al, Handbook of mineralogy (2001) |
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| Geological Environment |
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| Where found: | Occurs as a latestage mineral in complex granite pegmatitesMichael O’Donoghue, Gems, Sixth Edition (2006) |
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| Further Information |
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| Mineral information: | Hurlbutite information at mindat.org |
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| Significant Gem Localities |
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| USA | | |
| Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 418 |
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