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Crystal system |
hexagonal. |
Habit |
granular, tabular or earthy; rhombohedrons with curved faces in crystal form; rarely botryoidal (stacked bubble look) |
Cleavage |
perfect. |
Fracture |
uneven to conchoidal. |
Hardness |
3.5-4 |
Specific Gravity |
3.7 - 3.9 |
Color |
pale yellow to dark brown or black. |
Luster |
transparent to translucent vitreous luster. |
Streak |
white. |
Distinguishing features |
soluble with hot HCl acid; it is distinguished from eudialyte by color. |
Uses |
important iron mineral as it makes up about 48% of the mineral.
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