The structures of both families of synthetic compounds may be considered as based on the layered structure of
brucite, (Mg[(OH).sub.2]) [2].
In comparison, the cation occupying the Y position of the crystal structure forms a
brucite structure with [O.sup.2-], O[H.sup.-], and [F.sup.-].
Due to the production of O[H.sup.-], the magnesium ions will react with O[H.sup.-] and are deposited as
brucite of Mg[(OH).sub.2] on the steel surface.
Magnesium sulfate (MgS[O.sub.4]) is the most aggressive of sulfates due to the lowering of the pH of the solution of the pores in the cement paste hydrated by the reaction with the portlandite and the formation of
brucite [2].
1) indicated that all soil solutions were under-saturated with respect to anhydrite (average SI =-3.1), aragonite (-0.92), calcite (-0.76),
brucite (-6.1), dolomite (disordered) (-2.9), dolomite (ordered) (-2.4) and gypsum (-2.8) for 0.5 h equilibration time.
The LDHs exhibit structures that derive from
brucite.
Brucite structure is based on infinite layers composed of octahedra that are connected to each other through their edges.
The reaction products identified by XRD included synthetic
brucite, Mg[(OH).sub.2], vaterite CaC[O.sub.3] and dolomite MgCa[(C[O.sub.3]).sub.2].
And there's spectroscopic evidence for water's action on Ceres' surface rocks, in the form of minerals never seen on other asteroids: potentially
brucite or another hydroxide, and carbonates.
The main minerals of this group are:
Brucite, Geothite, Diaspore, Bauxite, Lepidocrocite, Manganite, Groutite, Stainierite and Chalcopanite that this project discusses the diaspore minerals and processing of them from the diaspore minerals.