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The polymorphs differ in terms of the stacking of the layers. All forms of Al(OH) 3 crystals are hexagonal [disputed – discuss]: gibbsite is also known as γ-Al(OH) 3 [8] or α-Al(OH) 3 [citation needed] bayerite is also known as α-Al(OH) 3 [8] or β-alumina trihydrate [citation needed] nordstrandite is also known as Al(OH) 3 [8] doyleite
Ball-and-stick model of the part of the crystal structure of gibbsite. Gibbsite, Al(OH) 3, is one of the mineral forms of aluminium hydroxide. It is often designated as γ-Al(OH) 3 [2]: 2 (but sometimes as α-Al(OH) 3 [3]). It is also sometimes called hydrargillite (or hydrargyllite).
corundum (Al 2 O 3) aluminium oxide hydroxides diaspore (α-AlO(OH)) boehmite or böhmite (γ-AlO(OH)) akdalaite (5Al 2 O 3 ·H 2 O) (once believed to be 4Al 2 O 3 ·H 2 O), also called tohdite; aluminium hydroxides. gibbsite (often designated as γ-Al(OH) 3, but sometimes as α-Al(OH) 3, [4] sometimes called hydrargillite or hydrargyllite)
When the Bayer liquor is cooled, Al(OH) 3 precipitates, leaving the silicates in solution. NaAl(OH) 4 → NaOH + Al(OH) 3. The solid Al(OH) 3 Gibbsite is then calcined (heated to over 1100 °C) to give aluminium oxide: [7] 2 Al(OH) 3 → Al 2 O 3 + 3 H 2 O. The product aluminium oxide tends to be multi-phase, i.e., consisting of several phases ...
Jeremejevite is an aluminium borate mineral with variable fluoride and hydroxide ions. Its chemical formula is Al 6 B 5 O 15 (F,OH) 3.It is considered as one of the rarest, thus one of the most expensive stones.
Diaspore (/ ˈ d aɪ. ə ˌ s p ɔːr /) – also called diasporite, empholite, kayserite, or tanatarite – is an aluminium hydroxide oxide mineral, α-AlO(OH), crystallizing in the orthorhombic system and isomorphous with goethite.
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It has the general formula A 2 M 3 Si 3 O 12 [OH], where the A sites can contain large cations such as Ca 2+, Sr 2+, and rare-earth elements, and the M sites admit Al 3+, Fe 3+, Mn 3+, Fe 2+, or Mg 2+ among others. [5] However, a large amount of additional elements, including Th, U, Be, Zr, P, Ba, Cr and others may be present in the mineral.
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