Gamma Iron Oxy Hydroxide
Υ-Fe(3+)O(OH)
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Chemical name
Gamma Iron Oxy Hydroxide |
|
Mineral name
Lepidocrocite |
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Chemical formula
Υ-Fe(3+)O(OH) |
|
Crystal system
orthorhombic |
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Crystal Class
orthorhombic-dipyramidal (2/m 2/m 2/m) |
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Space Group
Cmc2_1 |
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Unit cell
a [Å]:3.88 b [Å]:12.54 c [Å]:3.07 |
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Molecular weight [g/mol]
88.85 |
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Formula units
Z=4 |
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Frequent crystal surfaces
{010} |
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Mohs hardness
5 |
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Density [g/cm3]
4.0 |
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Cleavage
perfect on (010) |
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Fracture / Tenacity
uneven to conchoidal |
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Color
dark red to reddish brown |
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Streak
reddish to brownish |
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Transparency
transparent to opaque |
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Luster
submetallic, silky, adamantine |
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Optical character
biaxial (-) |
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Refractive Index
nα=1.940; nβ=2.200; nΥ=2.510 |
|
Birefringence δ
0.570 |
|
Pleochroism δ
strong |
