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Crystals once deep inside a volcano offer new view of magma,eruption timing
Crystals deep inside a volcano eruption timing
2017/6/15
Volcanologists are gaining a better understanding of what's going on inside the magma reservoir that lies below New Zealand's Mount Tarawera volcano. They're finding a colder, more solid place than th...
Volcanologists are gaining a new understanding of what’s going on inside the magma reservoir that lies below an active volcano, and they’re finding a colder, more solid place than previously thought, ...
Site preference of rare earth elements in fluorapatite: Binary (LREE+HREE)-substituted crystals
Site preference elements fluorapatite:Binary substituted crystals
1997/9/10
Crystalsofbinary(LREEHREE)-bearing?uorapatite[La,Gd-FAp,Ce,Dy-FAp,Pr,Er-FAp,Eu,Lu-FAp;CaNa REE (P Si O ) A ,with x 0.12¤C0.20 y 0.26¤10 x 2y y x y 1 x x 4 6 2/m]havebeengrownfromH O-richphosphate-?uor...
Statistical characteristics and origin of oscillatory zoning in crystals
Statistical characteristics origin oscillatory zoning crystals
1997/5/7
Complexintracrystallinezoningpatternsinhydrothermalgarnetandvesuvianiteand
magmaticplagioclasewereanalyzedbystatisticalmethodstotestforfractalbehavior.The
zoningdatawerecollectedbyelectronandprotonm...
Na, K, Rb and Cs exchange in heulandite single crystals: Diffusion kinetics
Na K Rb Cs exchange heulandite single Diffusion kinetics
1997/5/7
Diffusion-exchangekineticsweredeterminedattemperaturesbetween320and425KforNa
insinglecrystalsofnaturalheulandite,Na Ca K (Al Si O )!/n O,and
0.96 3.54 0.09 8.62 27.51 72 2K,Rb ,andCs forNa inNa-exch...
Cooling Rate Dependency of the Formation of Smectite Crystals from a High-Pressure and High-Temperature Hydrous Melt
High pressure experiment Quenching rate Smectite crystals
1995/12/1
The effect of cooling rate on the formation of smectite crystals with high crystallinity was investigated using two different types of high-pressure and high-temperature apparatus, a modified belt typ...
Morphology of Kaolinite Crystals Synthesized Under Hydrothermal Conditions
Crystal growth Electron microscopy Kaolinite Laths Morphology Plates Spherules Synthesis
1995/6/1
Scanning electron microscopy has revealed the presence of spherical, lath and platy kaolinite in gels with Si/Al atomic ratio ranging from 1.84 to 0.76 that are hydrothermally treated under different ...
Formation of Smectite Crystals at High Pressures and Temperatures
High pressure High temperature Smectite Synthesis
1994/12/1
Smectite single crystals of superior quality were synthesized at high pressures and temperatures using a modified belt type high pressure apparatus. Pressure-temperature conditions were established fo...
Hydration Behavior of Na-Smectite Crystals Synthesized at High Pressure and High Temperature
High-pressure experiment Hydration Relative humidity Smectite crystal
1994/12/1
Abstract: Hydration behavior of Na-smectite crystals synthesized at a pressure of 5.5 GPa and temperatures of 1400°–1500°C was examined by X-ray powder diffraction at various relative humidities (RH) ...
Fibrous sepiolite crystals derive much of their commercial value from their molecular size channels and grooves. The crystals fold upon drying and these channels and grooves are lost. A model for the ...
Occurrence of Collapsed and Expanded Crystals in Montmorillonite-Dextran Complexes
Expanded Crystals Montmorillonite-Dextran Complexes
1973/10/1
X-ray diffraction patterns obtained from montmorillonite-dextran complexes prepared with either B-512F or Polytran dextran showed maximum oven-dry crystal expansions of about 5·3 ∈. X-ray diffraction ...
Electron Microscopic Identification of Single Crystals of Wairakite, a Rare Component in Clays
Electron Microscopic Identification Single Crystals Clays
1969/11/1
Abstract: Crystallites of the finest fraction of a clay mineral from Rosamund, California, which account for over 50 per cent of the total weight, are identified as wairakite single crystals of 0·1–1 ...
Abstract: Dry aggregates of Na-illite or Na-montmorillonite usually disperse spontaneously when immersed in water. The corresponding Ca-clays show only limited swelling. However, the latter, when mech...
Fourier Transform Analysis: (1) X-ray Diffraction Effects by Finite Montmorillonite and Mica Crystals
X-ray Diffraction Effects Fourier Transform Analysis Montmorillonite Mica Crystals
1967/11/1
A computer program has been developed to generate the X-ray diffraction intensity distribution along any particular reciprocal lattice row, plane, or volume, for any arbitrary group of atoms within a ...
In Fuente Valoria, Province of Soria, Spain, medium-sized crystals of pyrite with a pronounced distorted cubic habit occur in calcareous rocks that are mined for ornamental use. The variations of the ...