Gibbsite
Gibbsite, Al(OH)3, is one of the mineral forms of aluminium hydroxide. It is often designated as γ-Al(OH)3: 2 (but sometimes as α-Al(OH)3). It is also sometimes called hydrargillite (or hydrargyllite).
| Gibbsite | |
|---|---|
Gibbsite | |
| General | |
| Category | Hydroxide minerals |
| Formula (repeating unit) | Al(OH)3 |
| IMA symbol | Gbb |
| Strunz classification | 4.FE.10 |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | P21/n |
| Identification | |
| Mohs scale hardness | 2.5–3 |
| Specific gravity | 2.35 |
Gibbsite is an important ore of aluminium in that it is one of three main phases that make up the rock bauxite.
Gibbsite has three named structural polymorphs or polytypes: bayerite (designated often as α-Al(OH)3,: 2 but sometimes as β-Al(OH)3), doyleite, and nordstrandite. Gibbsite can be monoclinic or triclinic, while bayerite is monoclinic.: 13 Doyleite and nordstrandite are triclinic forms.: 13
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