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Sphalerite,
also known as Blende, is one of the few minerals having six directions
of cleavage. If six directions are perfectly cleaved on a single
crystal, it forms rhombic dodecahedron. However, identifying the six
directions in a single piece is quite difficult because of multiple
twinning and the many directions. Only the abundant cleavage at
different directions are seen easily.|
Name |
Moh's |
Specific Gravity |
Structure |
Cleavage |
Refractive Index |
Double |
Disp. |
Pleochro |
Fluorescence
|
| Sphalerite | 3.5+ | 4.08-4.10 | Cubic | Perfect | 2.368-2.371 | None | 0.156 | None | Variable to None |
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