| Click on a subgroup to view further divisions.
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| 2/A | Nonmetallic Carbides and Nitrides |
| 2/B | Metal Sulfides, M: S > 1: 1 (mainly 2: 1) |
| 2/C | Metal Sulfides, M: S = 1: 1 (and similar) |
| 2/D | Metal Sulfides, M: S = 3 :4 and 2:3 |
| 2/E | Metal Sulfides, M: S <= 1:2 |
| 2/F | Sulfides of arsenic, alkalies; sulfides with halide, oxide, hydroxide, H2O |
| 2/G | Sulfarsenites, sulfantimonites, sulfbismuthites |
| 2/H | Sulfosalts of SnS archetype |
| 2/J | Sulfosalts of PbS archetype |
| 2/K | Sulfarsenates |
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