Two samples of hydroxyl-clinohumite, sample SZ0407B with approximate composition Mg8.674(14) Fe0.374(4)(Si0.99(1)O4)4(OH)2 and sample SZ0411B with composition Mg9(SiO4)4(OH)2, were synthesized at 12 GPa and 1,250 C coexisting with olivine. Unit-cell parameters determined by single-crystal X-ray diffraction are given as follows: a = 4.7525(4) Å, b = 10.2935(12) Å, c =13.7077(10) Å, a = 100.645(9...

Hydrotalcite (HT) and other layered double metal hydroxides are of great interest as gene delivery and timed release drug delivery systems and as enteric vehicles for biologically active molecules that are sensitive to gastric fluids. HT is a naturally occurring double metal hydroxide that can be synthesized as a nanomaterial consisting of a brucite structure with isomorphous substitution of al...

Intercalation of 4-amino benzoic acid (4-AB) into Zn/Al-nitrate layered double hydroxide (ZAL2) to form Zn/Al-4AB (ZALAB) compound was successfully synthesized from nitrate salt by using direct co-precipitation method. ZALAB confirmed Powder X-ray diffraction (PXRD) pattern with a basal spacing 15.3 Å. The presence COO- and C6H5NH2 functional groups 4-AB at 1,517 1,178 cm–1 in Fourier transform...

Field observations within the Atg-serpentinite domain of subducted ultramafic massif from Cerro del Almirez (SE Spain) reveal existence two generations abundant olivine-rich veins formed as open, mixed mode and shear fractures during prograde metamorphism. Type I were synchronous with development serpentinite main foliation (S 1 ) shearing, whereas II post-date S surfaces. These structural rela...

We present a systematic study of the transformation brushite (dicalcium phosphate dihydrate, CaHPO4•2H2O) under irradiation electrons well-defined energy (2.5 MeV) and flux as function dose. Contrarily to model hydroxides such portlandite brucite, which are very resistant electron radiation damage, studied decomposes quite easily, even for low doses. Irradiated samples were characterized using ...

The Gardanne alumina plant (Marseille region, Southeast France) has disposed its residues as a slurry (red muds) in the Mediterranean Sea up to 2015 when new regulations allowed sole discharge of clarified effluent. This reduced quantity suspended material from ~300 g/L less than 10 mg/L. detailed chemical composition this effluent been determined by ICP-OES, ionic chromatography, 1H NMR spectr...