Hydrous, silica-rich melts in the sub-arc mantle and their relationship with erupted arc lavas

Nature ◽  
1995 ◽  
Vol 377 (6550) ◽  
pp. 595-600 ◽  
Author(s):  
P. Schiano ◽  
R. Clocchiatti ◽  
N. Shimizu ◽  
R. C. Maury ◽  
K. P. Jochum ◽  
...  
Keyword(s):  
Hydrous Silica

Sorption studies of europium(III) on hydrous silica

2006 ◽  
Vol 270 (2) ◽  
pp. 277-283 ◽  
Author(s):  
P. N. Pathak ◽  
G. R. Choppin
Keyword(s):  
Hydrous Silica

Structure and Speciation in Hydrous Silica Melts. 1. Temperature and Composition Effects

2008 ◽  
Vol 112 (41) ◽  
pp. 13005-13014 ◽  
Author(s):  
Kelly E. Anderson ◽  
Marc M. Hirschmann ◽  
J. Ilja Siepmann
Keyword(s):  
Composition Effects ◽  
Hydrous Silica

Transport properties of hydrous-silica-modified MF-4SK membranes

2008 ◽  
Vol 53 (10) ◽  
pp. 1531-1535 ◽  
Author(s):  
E. Yu. Voropaeva ◽  
I. A. Stenina ◽  
A. B. Yaroslavtsev
Keyword(s):  
Transport Properties ◽  
Hydrous Silica

scholarly journals FAAS, FT-IR and XRD Identification of Natural and Heat Treated Opals Located in Wadla Woreda, North Wello, Ethiopia

2020 ◽  
pp. 1-8
Author(s):  
Adere Tarekegne Habte ◽  
Shiferaw Dessie Mekonnen ◽  
Adugna Nigatu Alene ◽  
Gietu Yirga Abate
Keyword(s):  
Optical Properties ◽  
Powder Diffraction ◽  
X Ray ◽  
Naturally Occurring ◽  
Heat Treated ◽  
Silica Materials ◽  
Hydrous Silica ◽  
Ft Ir ◽  
Diffraction Patterns ◽  
North Wollo

Opals are naturally occurring hydrous silica materials (SiO2*nH2O), and have been largely used in jewelry and as decorative elements in artworks due to their optical properties. In this study, we present some gemological properties, a combined spectroscopic (FAAS, FTIR) and X-ray powder diffraction (XRD) identification of natural and heat treated opals obtained from the main deposits in North Wollo, Ethiopia. The gemological measurements, FTIR and XRD spectra for natural and heat treated samples are nearly identical, FAAS shows clear differences on their color this may be due to the concentration differences of metals. Both of these opals showed spectra and diffraction patterns typical of Opal-CT, with clearly defined patterns and main peaks in the 2θ range of cristobalite and tridymite, called microcrystalline opals.

Hydrous Silica Coatings: Occurrence, Speciation of Metals, and Environmental Significance

2009 ◽  
Vol 43 (23) ◽  
pp. 8775-8780 ◽  
Author(s):  
Michael Schindler ◽  
Jennifer L. Durocher ◽  
Yassir. Abdu ◽  
Frank. C. Hawthorne
Keyword(s):  
Environmental Significance ◽  
Silica Coatings ◽  
Hydrous Silica
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