| General Information |
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| Chemical Formula | Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Physical Properties of Copal |
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| Mohs Hardness | 2 to 3Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Specific Gravity | 1 to 1.1Roger Dedeyn, Tables of Gemstone Identification (2007) |
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| Optical Properties of Copal |
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| Refractive Index | 1.539 to 1.545Roger Dedeyn, Tables of Gemstone Identification (2007) |
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| Optical Character | IsotropicUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Colour |
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| Colour (General) | Yellow, white, red, green, blue, brown, blackUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Causes of Colour | Charge transfer processes in large organic moleculesGems & Gemology (1988) |
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| Transparency | Transparent,Translucent,OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Fluorescence & other light emissions |
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| Fluorescence (Short Wave UV) | Possible whitish reactionHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Crystallography of Copal |
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| Crystal System | AmorphousUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Further Information |
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| Mineral information: | Copal information at mindat.org |
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