Aluminium Oxy Hydroxide
AlO(OH)
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Chemical name
Aluminium Oxy Hydroxide |
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Mineral name
Diaspore |
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Chemical formula
AlO(OH) |
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Melting point [°C]
N/A |
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Crystal system
orthorhombic |
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Crystal Class
orthorhombic-dipyramidal (2/m 2/m 2/m) |
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Space Group
Pbnm |
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Unit cell
a [Å]:4.40 b [Å]:9.42 c [Å]:2.84 |
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Molecular weight [g/mol]
59,97 |
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Formula units
Z=4 |
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Twinning
twinning on {021} or pseudohexagonal aggregates |
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Mohs hardness
6.5 - 7 |
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Density [g/cm3]
3.3 -3.5 |
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Cleavage
perfect on {010}, distinct on {100} and indistinct {100} |
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Fracture / Tenacity
conchoidal |
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Color
white, pale gray, colorless, greenish gray, brown, pale yellow, pink, purple |
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Streak
white |
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Transparency
transparent to translucent |
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Luster
vitreous, pearly |
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Optical character
biaxial (+) |
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Refractive Index
nα=1.682-1.706; nβ=1.705-1.725; nΥ=1.730-1.752 |
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Birefringence δ
0.048 |
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Pleochroism δ
strong |
