| General Information |
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| Chemical Formula | Michael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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| Physical Properties of Siderite |
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| Mohs Hardness | 4 to 4.5Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Specific Gravity | 3.83 to 3.89Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Tenacity | BrittleAnthony et al, Handbook of mineralogy (2001) |
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| Cleavage Quality | PerfectUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Fracture | Uneven,ConchoidalAnthony et al, Handbook of mineralogy (2001) More from other references |
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| Optical Properties of Siderite |
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| Refractive Index | 1.633 to 1.875Ulrich 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 | 0.240Ulrich 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 | StrongArthur Thomas, Gemstones (2009) |
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| Colour |
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| Colour (General) | White, yellowish-white, yellow, brownUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Transparency | Transparent,Translucent,OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Lustre | Vitreous,Silky,PearlyAnthony et al, Handbook of mineralogy (2001) More from other references |
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| Crystallography of Siderite |
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| Crystal System | TrigonalUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Habit | Rhombohedral to steep scalenohedralMichael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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| Geological Environment |
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| Where found: | Siderite occurs in sedimentary deposits and hydrothermal ore veins.Michael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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| Further Information |
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| Mineral information: | Siderite information at mindat.org |
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| Significant Gem Localities |
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| Brazil | | |
| Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 451 | | Portugal | | |
| Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 451 |
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