| General Information |
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| A variety or type of: | Precious Opal, which is a variety of Opal |
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| Chemical Formula | Walter Schumann, Gemstones of the world (2001) |
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| Physical Properties of Harlequin Opal |
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| Mohs Hardness | 5.5 to 6.5Walter Schumann, Gemstones of the world (2001) |
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| Specific Gravity | 1.98 to 2.50Walter Schumann, Gemstones of the world (2001) |
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| Tenacity | BrittleWalter Schumann, Gemstones of the world (2001) |
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| Cleavage Quality | NoneWalter Schumann, Gemstones of the world (2001) |
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| Fracture | Conchoidal,SplinteryWalter Schumann, Gemstones of the world (2001) |
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| Optical Properties of Harlequin Opal |
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| Refractive Index | 1.37 to 1.52Walter Schumann, Gemstones of the world (2001) |
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| Birefringence | NoneWalter Schumann, Gemstones of the world (2001) |
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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) | All colours.Walter Schumann, Gemstones of the world (2001) |
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| Transparency | Transparent,TranslucentWalter Schumann, Gemstones of the world (2001) |
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| Crystallography of Harlequin Opal |
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| Crystal System | AmorphousWalter Schumann, Gemstones of the world (2001) |
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| Habit | Kidney- or grape-shaped aggregatesWalter Schumann, Gemstones of the world (2001) |
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| Further Information |
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| Mineral information: | Harlequin Opal information at mindat.org |
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| Significant Gem Localities |
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