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Material/Specimen
- Tantalum boride8
- Tantalum nitride8
- Tungsten carbide8
- Barium tungstate5
- Cobalt tungstate5
- Copper tungstate5
- Nickel tungstate5
- Silver(I) tungstate5
- Zinc tungstate5
- Erbium chloride Hydrous4
- Erbium fluoride Anhydrous4
- Erbium hydride4
- Erbium nitrate Hydrous4
- Erbium oxalate Hydrous4
- Erbium oxide4
- Erbium sulfide4
- Iron tungstate4
- Lead zirconate4
- Manganese tungstate4
- Tantalum4