| General Information |
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| Chemical Formula | Gemdat.org, Management Team (2012) |
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| Physical Properties of Hercynite |
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| Mohs Hardness | 7.5Gemdat.org, Management Team (2012) |
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| Specific Gravity | 4.39Gemdat.org, Management Team (2012) |
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| Tenacity | BrittleGemdat.org, Management Team (2012) |
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| Fracture | ConchoidalGemdat.org, Management Team (2012) |
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| Colour |
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| Colour (General) | Dark blue-green, yellow, brownGemdat.org, Management Team (2012) |
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| Transparency | TranslucentGemdat.org, Management Team (2012) |
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| Lustre | VitreousGemdat.org, Management Team (2012) |
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| Crystallography of Hercynite |
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| Crystal System | IsometricGemdat.org, Management Team (2012) |
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| Habit | Crystals usually octahedralGemdat.org, Management Team (2012) |
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| Further Information |
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| Mineral information: | Hercynite information at mindat.org |
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