Chromium(III) hydroxide is a gelatinous green inorganic compound with the chemical formula Cr(OH)3. It is a polymer with an undefined structure and low solubility. It is amphoteric, dissolving in both strong alkalis and strong acids.[2]
It is used as a pigment, as a mordant, and as a catalyst for organic reactions.[3]
It is manufactured by adding a solution of ammonium hydroxide to a solution of chromium salt.[citation needed]
Pure Cr(OH)3 is as yet (2020) unknown among the mineral species. However, three natural polymorphs of the oxyhydroxide, CrO(OH), are known: bracewellite, grimaldiite and guyanaite.[4][5][6][7]
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