General Information |
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Chemical Formula | Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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Photos of natural/un-cut material from mindat.org |
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Physical Properties of Friedelite |
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Mohs Hardness | 4 to 5Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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Specific Gravity | 3.06 to 3.19Walter Schumann, Gemstones of the world (2001) More from other references |
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Cleavage Quality | PerfectUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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Fracture | UnevenArthur Thomas, Gemstones (2009) |
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Optical Properties of Friedelite |
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Refractive Index | 1.627 to 1.663Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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Optical Character | Uniaxial/-Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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Birefringence | 0.032 to 0.035Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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Pleochroism | NilArthur Thomas, Gemstones (2009) |
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Dispersion | NilArthur Thomas, Gemstones (2009) |
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Colour |
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Colour (General) | Pink, red, brown, yellowUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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Transparency | Translucent,OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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Lustre | VitreousArthur Thomas, Gemstones (2009) |
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Fluorescence & other light emissions |
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Fluorescence (General) | ReddishUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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Fluorescence (Short Wave UV) | Some specimens have shown green fluorescenceMichael O’Donoghue, Gems, Sixth Edition (2006) |
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Fluorescence (Long-Wave UV) | Some specimens have shown yellow fluorescenceMichael O’Donoghue, Gems, Sixth Edition (2006) |
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Crystallography of Friedelite |
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Crystal System | MonoclinicWalter Schumann, Gemstones of the world (2001) More from other references |
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Habit | Pseudohexagonal tabletsMichael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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Geological Environment |
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Where found: | Occur in metamorphosed manganese–iron depositsMichael O’Donoghue, Gems, Sixth Edition (2006) |
Further Information |
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Mineral information: | Friedelite information at mindat.org |
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Significant Gem Localities |
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| USA | |
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| Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 413 |
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