Gahnite
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Physical & Optical Properties
Mohs Hardness
| Mohs | Reference mineral | Gahnite |
|---|---|---|
| 1 | Talc | |
| 2 | Gypsum | |
| 3 | Calcite | |
| 4 | Fluorite | |
| 5 | Apatite | |
| 6 | Orthoclase | |
| 7 | Quartz | |
| 8 | Topaz | ● |
| 9 | Corundum | |
| 10 | Diamond |
Crystal System
Value & Market
Where to Buy Gahnite
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About Gahnite
Gahnite is a zinc aluminum oxide spinel, typically occurring in dark blue to blue-green, olive, or nearly black colors with a vitreous luster and good hardness (Mohs 7.5–8). It forms in granite pegmatites, metamorphic rocks, and zinc ore deposits, with gem-quality blue material found in Australia, Sweden, Brazil, and Madagascar. Faceted gahnite exhibits strong color saturation and attractive dispersion, making it a sought-after collector gem.
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Jewelry Use
Suitable for daily wear