Hercynite
Hercynite is named after Silva Hercynia, the Latin name for the Bohemian Forest, where the mineral was discovered.
Hercynite is a mineral of spinel group. It forms dark blue-green, yellow, brown crystals with vitreous lustre.
Hercynite is a mineral of spinel group. It forms dark blue-green, yellow, brown crystals with vitreous lustre.
| General Information | ||||||||||||||
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| Chemical Formula |
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| Physical Properties of Hercynite | ||||||||||||||
| Mohs Hardness | 7.5 to 8, Handbook of mineralogy (2001) | |||||||||||||
| Specific Gravity | 4.39, Management Team (2012) CalculatedMore from other references | |||||||||||||
| Tenacity | Brittle, Management Team (2012) | |||||||||||||
| Fracture | Conchoidal, Management Team (2012) More from other references | |||||||||||||
| Optical Properties of Hercynite | ||||||||||||||
| Refractive Index | 1.80 to 1.83, Handbook of mineralogy (2001) | |||||||||||||
| Optical Character | Isotropic, Handbook of mineralogy (2001) | |||||||||||||
| Colour | ||||||||||||||
| Colour (General) | Dark blue-green, yellow, brown, Management Team (2012) More from other references | |||||||||||||
| Transparency | Translucent,Opaque, Handbook of mineralogy (2001) Translucent through thin edges. | |||||||||||||
| Lustre | Vitreous, Handbook of mineralogy (2001) | |||||||||||||
| Crystallography of Hercynite | ||||||||||||||
| Crystal System | Isometric, Management Team (2012) More from other references | |||||||||||||
| Habit | Crystals usually octahedral, Management Team (2012) More from other references | |||||||||||||
| Geological Environment | ||||||||||||||
| Where found: | In high-grade metamorphosed ferruginous argillaceous sediments and in some mafic and ultramafic igneous rocks. Also in placers., Handbook of mineralogy (2001) | |||||||||||||
| Further Information | ||||||||||||||
| Mineral information: | Hercynite information at mindat.org | |||||||||||||
| Significant Gem Localities | ||||||||||||||
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