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Cryolite (Na3AlF6) D01047 |
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| Crystal system | monoclinic (characterized by either a single 2-fold symmetry and/or a single plane of symmetry). |
| Habit | pseudo-cubic crystals or short prisms. |
| Cleavage | none. |
| Fracture | uneven. |
| Hardness | 2.5 |
| Specific Gravity | 2.95 |
| Color | colorless, white, brown, red, black or gray. |
| Luster | transparent and are vitreous to pearly in luster. |
| Streak | white. |
| Distinguishing features | almost disappears from sight when immersed in water.. |
| Uses | in pottery glazes and in certain types of glass. |
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