Goethite
[Chemical composition] different causes of goethite different components mixed into: hydrothermal genesis, its pure components; exogenous Causes frequently containing Al 2 O 3, SiO 2, MnO 2, CaO , etc., which in addition to some Al like outer replaced with other components tend to be mechanically mixed substance class or adsorption material; metal oxide with a goethite deposits also often contain Cu, Pb, Zn, Cd and the like; and ultrabasic rocks wEATHERING The goethite contains Co and Ni. Those containing adsorbed water are called water needle iron ore (α-FeO(OH)·nH 2 O).
[crystal structure] orthorhombic system 
; a 0 =0.465 nm, b 0 = 1.002 nm, c 0 =0.304 nm; Z=4. Diaspore same crystal structure, i.e., crystal structure and O 2- (OH) - the most common hexagonal close packed (a stacked layer of a vertical axis), Fe 3+ octahedral filled 1/2. The [FeO 3 (OH) 3 ] octahedrons are joined in a co-edge manner into octahedral chains parallel to the c-axis; the double-strands are connected in such a way as to share the octahedral apex (this apex is O 2 - occupied).
[Form] Single crystals are rare, and they are usually needle-like or scaly, kidney-like, stalactite-like, tuberculous or soil-like aggregates.
[Physical properties] brownish yellow to brownish red; streak brownish yellow; semi-metallic luster; tuberculosis, earthy luster. Cleavage parallel {010} complete; jagged fracture. Hardness 5 to 5.5. The relative density is 4.28, but it can be as low as 3.3. Crisp.
[genesis and occurrence] Goethite is one of the widely distributed minerals, the most important component of limonite, and often symbiotic with fibrite. It is mainly iron mineral weathering products, outcrop section often distributed in the copper iron sulfide deposits constitute "iron cap." The goethite of sedimentary genesis is found in lakes and springs. In addition, occasionally there are low temperature hydrothermal genes that are produced in the voids of some hydrothermal veins. In the regional metamorphism, it can be dehydrated and converted into hematite or magnetite.
[identification characteristics] is characterized by its colloidal morphology and brown-yellow streaks.
[Main use] is a mineral raw material for iron making. The “iron cap†is a sign for the search for the original copper-iron sulphide deposit.
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