Search Results
1962 Geometry of structures consisting of water molecules in hydrated crystals J. Struct. Chem. 3 206 226 . J
An "unknown Ni-Al hydrosilicate" was found in the karstic nickel deposits in the localities Ba and Takovo in Serbia, and Aghios Ioannis in Greece. It occurs in fine-grained bluish-green and green aggregates with takovite and hydrated halloysite. It is an epigenetic product in the karstic nickel deposit. X-ray powder diffraction (XRPD) data are indexed with a monoclinic unit cell, a = 8.524 (4), b = 7.490 (3), c = 24.214 (6) Å, b = 104.55 (6)°, V = 1545.9 Å3. The thermal study has shown a characteristic dehydroxylation effect at 450 °C, which distinguishes this mineral from takovite and halloysite. The infra-red technique is very sensitive for the detection of the "unknown Ni-Al hydrosilicate": an absorption band between 1250 cm-1 and 1270 cm-1 is very characteristic for this mineral. From chemical analyses of the admixture of this mineral and hydrated halloysite in different proportions from the Aghios Ioannis deposit in Greece, after removal of impurities, the calculated formula is close to Ni2.00 Al2.00 (Si1.93 Al0.07) on the basis of 12 (O,OH).
.L. Griffith E.L. Shock 1997 Hydrothermal hydration of Martian crust: illustration via geochemical model calculations Journal of Geophysical
studies are available ( Snoeck and Pellegrini, 2015 ; Garvie-Lok et al., 2004 ; Pellegrini and Snoeck, 2016 ), where hydrogen peroxide in different concentrations, sodium hypochlorite and hydrazine hydrate were investigated as pre-cleaning agents. The
peak is not specific to dioctahedral smectite; rather it is interpreted to result from the exchange of interlayer cations to Ca and its hydration layer, which was caused by the acetic acid leaching ( Moore & Reynolds, 1997 ). Beside smectite, other
field development strategy or production optimization opportunities (Carbonate reservoir modelling in Oman: Abbaszadeh et al., 2000 ; gas hydrates from Japan: Aung et al., 2011 ; mature field review: Martino et al., 2012 ; a giant field's integrated
cation-hydration effect on the crystallization of Ca–Mg–CO3 systems . Proceedings of the National Academy of Sciences of the United States of America , 110 ( 44 ): 17750 – 17755 . 10.1073/pnas.1307612110
Whitney and Evans (2010) Considering the above reaction, the kyanite + biotite paragenesis could appear at >500 °C and >400 MPa because of a prograde hydration process. Based on a previous study ( Kendrick and Indares, 2017 ), one possible explanation for
, J. , Vona , A. , Kovács , I. J. , Fintor , K. , Buday , T. , Scarani , A. , & Harangi , Sz. ( 2019 ). Cooling and hydration of the Carpathian obsidian, a differential scanning calorimetry (DSC), thermogravimetry (DTA) and infrared
magma-derived crystals (e.g., pyroxene) and a volatile-rich, felsic magma leads to the formation of polycrystalline amphibole-rich clusters ( Vernon, 1984 , 1990 ; Castro and Stephens, 1992 ; Zorpi et al., 1991 ). Further hybridization (hydration and
