Goethite - Alfa iron oxy Hydroxide
α-FeO(OH)
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Crystal system |
Orthorhombic 2/m2/m2/m |
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Color |
Yellowish to dark brown |
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Clavage |
Perfect 010 |
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Fracture |
uneven to splintery |
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Mohs scale hardness |
5 - 5.5 |
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Specific gravity |
3.3 - 3.4 |
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Refractiveindex |
Opaque to sub-translucent |
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Unit Ce4 |
a = 4.65 Å |
