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Genthelvite (Zn4Be3(SiO4)3S) J02921 |
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| Crystal system | isometric. |
| Habit | a sharp simple tetrahedron. |
| Cleavage | none. |
| Fracture | uneven. |
| Hardness | 6-6.5 |
| Specific Gravity | 3.7 |
| Color | white, pale yellow, lemon yellow, green/yellow, very pale green or very pale brown. |
| Luster | this opaque mineral has a vitreous luster on external surfaces and a resinous or greasy luster on internal surfaces. |
| Streak | none. |
| Distinguishing features | fluoresces intense green under ultraviolet radiation and remains phosphorescent for a short period; also its simple tetrahedral habit is characteristic. |
| Uses | of interest to collectors and researchers. |
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