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The article contains sections titled: 1. Introduction 2. Chromium Ores 2.1. Ore Deposits 2.2. Ore Beneficiation 3. Production of Sodium Dichromate 3.1. Alkaline Roasting 3.2. Leaching of the Roast 3.3. Acidification 3.4. Crystallization 4. Chromium Oxides 4.1. Chromium(III) Oxide and Chromium Hydroxide 4.2. Chromium(IV) Oxide (Chromium Dioxide) 4.3. Chromium(VI) Oxide 5. Chromium(III) Salts 5.1. General Properties 5.2. Chromium(III) Sulfates and Chrome Tanning Agents 5.3. Other Chromium(III) Salts 6. Chromic Acids and Chromates(VI) 6.1. Chromic Acids 6.2. Alkali Chromates and Dichromates 6.3. Other Chromates 7. Other Chromium Compounds 8. Analysis 9. Transportation, Storage, and Handling 10. Environmental Protection 11. Ecotoxicology 12. Nutrition 13. Toxicology and Occupational Health 14. Economic Aspects

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