A binary compound of sulphur with another element or group.
- Most pure metals, when freshly cut to expose a new surface, are lustrous, but most lose this luster quickly by combining with oxygen, carbon dioxide or hydrogen sulfide to form oxides, carbonates or sulfides.
- DOCs include all compounds of carbon except for its oxides, sulphides and metal carbonates if they are identifiable by chemical name.
- The technique can identify iron-bearing phases (such as oxides, silicates, sulfides, sulfates, and carbonates), as well as the amount of iron in each phase and the presence of iron in various oxidation states.
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