A white, grey, or greenish mineral typically occurring in the form of tabular crystals. It consists of hydrated magnesium hydroxide.
- The spacing between the protruding oxygen atoms is comparable to the spacing between certain of the hydroxyl groups in layers of magnesium hydroxide (brucite) or aluminum hydroxide (gibbsite).
- In the presence of excess ground waters, brucite in the friable matrix dissolves, leaving behind a residue of amorphous iron oxides.
- The individual magnesium hydroxide layers are identical to the individual layers of brucite and are referred to as the ‘brucite layers’.
Early 19th century: named after Archibald Bruce (1777–1818), American mineralogist, + -ite1.
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