Franklinite
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Physical & Optical Properties
Mohs Hardness
| Mohs | Reference mineral | Franklinite |
|---|---|---|
| 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 Franklinite
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About Franklinite
Franklinite is a zinc iron manganese oxide mineral in the spinel group, characterized by its opaque black appearance with a metallic to submetallic luster and octahedral crystal habit. It is named after and intimately associated with the world-famous Franklin Furnace zinc deposit in New Jersey, USA, one of the most mineralogically diverse localities on Earth. Faceting is impossible due to opacity, but well-formed crystals are highly sought by mineral collectors.