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Pyrite cubic crystals on marl from Navajún, La Rioja, Spain (size: 95 by 78 millimetres [3.7 by 3.1 in], 512 grams [18.1 oz]; main crystal: 31 millimetres [1.2 in] on edge) Pyrite's metallic luster and pale brass-yellow hue give it a superficial resemblance to gold, hence the well-known nickname of fool's gold.
The group is named for its most common member, pyrite (fool's gold), which is sometimes explicitly distinguished from the group's other members as iron pyrite. Pyrrhotite (magnetic pyrite) is magnetic, and is composed of iron and sulfur , but it has a different structure and is not in the pyrite group.
These include ε-FeOOH, which has an orthorhombic crystal structure, [10] a cubic pyrite-type polymorph with [11] or without losing hydrogen [12] and an ultradense hexagonal structure. [13] Goethite has the same crystal structure as diaspore, the analogous aluminium oxide-hydroxide mineral. Oxygen and hydroxide ions form a hexagonal close ...
February 2016) (Learn how and when to remove this message) Pressure oxidation is a process for extracting gold from refractory ore . The most common refractory ores are pyrite and arsenopyrite , which are sulfide ores that trap the gold within them.
Polymetallic ores or multimetal ores are complex ores containing a number of chemical elements, among which the most important are lead and zinc.In addition, polymetallic ores can contain copper, gold, silver, cadmium, sometimes bismuth, tin, indium and gallium. [1]
Mundic once [2] referred to pyrite, [3] but has now adopted the wider meaning of concrete deterioration caused by oxidisation of pyrites within the aggregate (usually originating from mine waste). The action of water and oxygen on pyrite forms sulphate (a salt of sulphuric acid ), thereby depleting the pyrite, causing loss of adhesion and ...
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Ruthenium forms dichalcogenides, which are diamagnetic semiconductors crystallizing in the pyrite structure. [4] Ruthenium sulfide (RuS 2 ) occurs naturally as the mineral laurite . Like iron, ruthenium does not readily form oxoanions and prefers to achieve high coordination numbers with hydroxide ions instead.