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Hilairite (Na2ZrSi3O9·3H2O) J02851 |
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![Image: J2851.01.jpg](../minerals_jpg/J2851.01.jpg) |
Crystal system |
hexagonal. |
Habit |
short to elongated trigonal or hexagonal prisms terminated with a rhombohedron; commonly twinned. |
Cleavage |
none. |
Fracture |
conchoidal to uneven. |
Hardness |
4 |
Specific Gravity |
2.7 |
Color |
pale to dark brown or pink to rose colored. |
Luster |
vitreous to waxy and is transparent. |
Streak |
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Distinguishing features |
being colorless in small samples, having a hardness of 4 and being only slightly reactive to HCl acid is characteristic. |
Uses |
of interest to collectors and researchers.
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