General Information |
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A variety or type of: | Chalcedony, which is a variety of Quartz |
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Chemical Formula | Arthur Thomas, Gemstones (2009) |
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Photos of natural/un-cut material from mindat.org |
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Physical Properties of Fire Agate |
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Mohs Hardness | 6.5 to 7Gemdat.org, Management Team (2012) |
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Specific Gravity | 2.60 to 2.64Walter Schumann, Gemstones of the world (2001) More from other references |
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Cleavage Quality | NoneWalter Schumann, Gemstones of the world (2001) |
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Fracture | UnevenWalter Schumann, Gemstones of the world (2001) |
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Optical Properties of Fire Agate |
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Refractive Index | 1.530 to 1.543Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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Optical Character | Uniaxial/+Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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Birefringence | 0.003 to 0.009Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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Pleochroism | AbsentWalter Schumann, Gemstones of the world (2001) |
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Dispersion | NoneWalter Schumann, Gemstones of the world (2001) |
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Colour |
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Colour (General) | Brown, red to orangeGemdat.org, Management Team (2012) |
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Causes of Colour | Inclusions of goethite or limonite, producing an iridescent effect or "fire."Gemdat.org, Management Team (2012) |
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Transparency | Translucent,OpaqueWalter Schumann, Gemstones of the world (2001) More from other references |
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Lustre | Vitreous,WaxyGemdat.org, Management Team (2012) |
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Crystallography of Fire Agate |
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Crystal System | TrigonalUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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Habit | Microcrystalline aggregatesWalter Schumann, Gemstones of the world (2001) |
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Inclusions in Fire Agate |
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Inclusions of goethite or limonite. |
Further Information |
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Mineral information: | Fire Agate information at mindat.org |
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