Color |
Black |
||
Cleavage |
{010} Perfect, {100} Parting, {102} Parting |
||
Density |
7.5 - 7.4, Average = 7.45 |
||
Diaphaneity |
Nearly opaque |
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Hardness |
4.5 - Between Fluorite and Apatite |
||
Gladstone-Dale |
Cl meas = -0.016 (Superior) - where the Cl = (1-KPDmeas/KC) |
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Optical Data |
Biaxial (+) |
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RL Bireflectance |
Weak |
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Refectivity |
400nm |
16.50 |
19.50 |
420nm |
16.40 |
19.20 |
|
440nm |
16.30 |
18.90 |
|
460nm |
16.20 |
18.70 |
|
480nm |
15.90 |
18.50 |
|
500nm |
16.00 |
18.70 |
|
520nm |
16.00 |
18.70 |
|
540nm |
16.00 |
18.70 |
|
560nm |
16.00 |
18.70 |
|
580nm |
15.80 |
18.60 |
|
600nm |
15.80 |
18.60 |
|
620nm |
15.70 |
18.60 |
|
640nm |
15.60 |
18.50 |
|
660nm |
15.50 |
18.30 |
|
680nm |
15.40 |
18.10 |
|
700nm |
15.50 |
18.00 |
|
Composition |
Molecular Weight = 303.69 gm |
||
Axial Ratios |
a:b:c = 0.838:1:0.8661 |
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Cell Dimensions |
a = 4.76 |
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Crystal System |
Monoclinic - Prismatic |
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Orientations |
[110] [110] [100] [011] [001] |
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Electron Density |
Bulk Density (Electron Density) = 6.59 gm/cc |
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Fermion Index |
Fermion Index = 0.09 |
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Photoelectric |
PEFerberite = 757.55 barns/electron |