Oxides and hydroxides: Goethite
Diagnostic Card.
Fe O (OH)
Crystal system orthorhombic
Hardness 5-5.5
Specific gravity 4.3
Cleavage is perfect
The break in the wrong
Color brown, black, yellow
Color powder brownish-yellow
Diamond Gloss, silky, earthy
It crystallizes mainly in the form of prisms, and sometimes differ greatly elongated vertical hatching. Less common are flattened crystals in thin plitochek. Some crystals are extremely rare, they almost always grow together, forming needle-like, fibrous, foliated or scaly aggregates. The most common dense clusters of massive, branching and stalactite, with earthy or radiant addition. Colour dark gray and brown in crystals, light-red or yellow-brown and ocher-yellow in earthy varieties.
Chemical composition. iron oxide (Fe2O3) 89.9% water (H2O) 10.1%. Form crystals. Prismatic, needle. Class symmetry. Rombo-bipyramidal - mmm. The ratio of the axes. 0.464: 1: 0.303. Cleavage. Good at (010). Aggregates. Dense, granular, radiant, fibrous.
Diagnostic features.
The powder was placed in a glass tube with a flame become reddish heated and converted to hematite, releasing water. It melts in a closed glass tube when heated loses water of crystallization.
Origin.
Primarily goethite product is iron oxidation of other minerals such as pyrite, magnetite, and siderite. He often formed under hydrothermal conditions in the form of beautiful crystals inside the radiant groups quartz geodes. Goethite is a significant part of the limonite formations that make up the so-called "yellow ocher".
Deposits and application.
In Italy there is in many places. Among them are the old iron ore development in Brosseau and Traverselle (Piedmont region), in Monte Castello Vicentino, Rio Marina, on the Elbe. Goethite - one of the best ore to iron.
Goethite. Volodarsk Volyn, Ukraine. 9 cm Photography:. © VA Sletov.
Goethite. Bakal, Yuzhn. Ural, Russia. Min. im.A.E. Museum Fersmana Photo: © AA Evseev.
Goethite, Kramatorsk, Donbass, south-east of Ukraine, CIS.
, Donbass, minerals (February 21, 2013, 10:43).
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