| Other sulfides, including pyrite, marcasite, chalcopyrite, and pyrrhotite, are occasionally found as well. |
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| Sometimes iron sulfides have weathered, staining the quartz an orange color, both on the surface and within the crystals themselves. |
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| Arsenopyrite, cassiterite, molybdenite, wolframite, uraninite, and several of the common sulfides have all been observed at various locations. |
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| These groups are the silicate minerals, carbonate minerals, oxides, sulfides, and halides. |
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| These metals occurs in the earth in the form of sulfides, such as copper sulfide, lead sulfide, and zinc sulfide. |
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| Commonly associated minerals include orpiment, stibnite, a variety of sulfides and sulfosalts, calcite, and barite. |
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| One is a copper sulfate assemblage, which is generally associated with copper carbonates, cuprite, sulfides, boltwoodite, and metazeunerite. |
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| Most metals are so readily oxidized by atmospheric oxygen that they are only found naturally as oxides, sulfides or salts. |
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| Iron and copper sulfides of this region are predominately pyrite, pyrrhotite, chalcopyrite, arsenopyrite, bornite, and marcasite. |
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| The solids used include natural clays and minerals, metal oxides and sulfides, metal salts, and mixed metal oxides. |
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| The most common of these are iron sulfides, but all heavy metals can occur as sulfide minerals. |
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| The onion family is rich in allyl sulfides, which can help lower high blood pressure and show promise in protecting against cancers of the stomach and the digestive tract. |
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| An enormous amount of mineralization remained, but it consisted only of deep, unoxidized sulfides so low in grade that mining them was not economical. |
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| In situations where large amounts of sulfides are being oxidized in this way, an enormous amount of acidity is associated with the sulfate product. |
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| The veins are surrounded by a 5-to 10-cm-wide alteration zone that consists of calcite, dolomite, diopside, hedenbergite, vesuvianite, and base-metal sulfides. |
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| Similarly, metallic iron and many other metals, alloys, oxides, sulfides and other compounds containing iron and a number of other transition metals can be magnetized. |
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| These results for nickel and silver indicate that Canwell sulfides are even more metal-rich than previously realized. |
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| Analysis of SCMC-related sulfides and sulfoxides in urine can be readily undertaken in any bioanalysis research laboratory. |
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| Modification of polyethylene film sulfurized in solution of higher polythionic acids by layers of copper sulfides. |
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| Where do the magnesium and magnesium sulfides go when they are freed from the solid charge pieces? |
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| The oxidation of sulfides leading to the formation of sulfuric acid can also be one of the corrosion factors in karst formation. |
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| The fungus also plays a role in the solubilization of heavy metal sulfides. |
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| Copper tarnishes when exposed to some sulfur compounds, with which it reacts to form various copper sulfides. |
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| Zinc is a chalcophile, meaning the element has a low affinity for oxides and prefers to bond with sulfides. |
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| With the exception of wurtzite, all these other minerals were formed by weathering of the primordial zinc sulfides. |
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| Many inorganic substances are insoluble too, including most metal oxides, sulfides, and silicates. |
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| It contains phenolic, aromatic, heterocyclic, and polycyclic organics, and inorganics including cyanides, sulfides, ammonium and ammonia. |
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| The pollution includes heavy metals, nitrogen, phosphorus, sulfides and supernutrition. |
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| Creamy white quartz contains black and grey sulfides with pyrite along the margins, cut by clear aphanitic chalcedony veins. |
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| The inclusions, too, are a function of the steel-making, and include oxides, silicates, aluminates, and sulfides. |
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| In addition, zinc sulfide, cyclic sulfides,and conjugated dienes and trienes form when reversion occurs. |
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| The EM conductors, at least the stronger ones, are very likely due to sulfides, one of which is probably pyrrhotite. |
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| Over the same period, approximately 70 percent of the sulfides originally present in the basalt have dissolved. |
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| These minerals are primarily carbonates, sulfides, or oxides of the metal, mixed with other components such as silica and alumina. |
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| He was one of the first scientists to suggest that iron sulfides and nickel sulfides might have held an important role in early life. |
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| The zones in 3 B are approximately the same in width and grade as the levels above showing good continuity of the massive sulfides zones of polybasite discovered previously. |
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| Once we begin to mill refractory sulfides we plan to cease processing oxide ore through the sulfide plant and to start processing refractory sulfide ore. |
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