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Carletonite (KNa4Ca4Si8O18(CO3)4(OH,F)·H2O) NS3752.02 |
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| Crystal system | tetragonal. |
| Habit | found in layered crystalline masses and well formed tetragonal prisms. |
| Cleavage | good to perfect. |
| Fracture | conchoidal. |
| Hardness | 4-4.5 |
| Specific Gravity | 2.45 |
| Color | varies intensely. Pale to deep cornflower-blue, pink to pale violet, white or colorless.; some crystals form a white outer edge with a deep blue center. |
| Luster | dull to vitreous or silky (like the surface of piece of silk material). |
| Streak | none. |
| Distinguishing features | the deep blue color and the gradual or sharp zoning of colors. |
| Uses | gemstones have been cut from this rare mineral. |
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