| General Information |
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| Chemical Formula | Michael O’Donoghue, Gems, Sixth Edition (2006) |
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| Physical Properties of Monazite |
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| Mohs Hardness | 5 to 5.5Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Specific Gravity | 4.80 to 5.50Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Cleavage Quality | PerfectUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Optical Properties of Monazite |
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| Refractive Index | 1.796 to 1.841Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Optical Character | Biaxial/+Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Birefringence | 0.045Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Colour |
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| Colour (General) | Yellow, yellow-brown, brownUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Colour (Daylight) | Colour change (reddish orange in daylight
to pinkish brown in tungsten light) is reported but is common enough when RE are involved in the composition.Michael O’Donoghue, Gems, Sixth Edition (2006) |
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| Colour (Incandescent Light) | Colour change (reddish orange in daylight
to pinkish brown in tungsten light) is reported but is common enough when RE are involved in the composition.Michael O’Donoghue, Gems, Sixth Edition (2006) |
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| Transparency | TransparentUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Fluorescence & other light emissions |
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| Fluorescence (Long-Wave UV) | Some specimens have shown a greenish fluorescenceMichael O’Donoghue, Gems, Sixth Edition (2006) |
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| Crystallography of Monazite |
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| Crystal System | MonoclinicUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Habit | Tabular, prismaticMichael O’Donoghue, Gems, Sixth Edition (2006) |
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| Geological Environment |
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| Where found: | Is found in igneous rocks including granite pegmatitesMichael O’Donoghue, Gems, Sixth Edition (2006) |
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| Further Information |
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| Mineral information: | Monazite information at mindat.org |
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| Significant Gem Localities |
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| Sri Lanka | | |
| Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 431 |
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