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) |
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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| Australia | |
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- Pastoral Unincorporated Area
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