Cryolite
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Physical & Optical Properties
Mohs Hardness
| Mohs | Reference mineral | Cryolite |
|---|---|---|
| 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 Cryolite
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About Cryolite
Cryolite is a rare sodium aluminum fluoride mineral historically mined only at Ivigtut, Greenland, where the world's sole commercially significant deposit was exhausted in the 1980s. Near-colorless and with a refractive index nearly identical to water, a cryolite crystal placed in water effectively becomes invisible—making it a scientifically fascinating optical curiosity. It was once used in large quantities for aluminum smelting before synthetic cryolite replaced the natural mineral.