1-20 OF 61 RESULTS FOR

chemical analyses by end member molecules

Results shown limited to content with bounding coordinates.
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Journal Article
Published: 01 June 2011
The Canadian Mineralogist (2011) 49 (3): 835–847.
.... (1968) with the samples used in the original description. The chemical composition reported by those authors (wt%, mean and standard deviation of three analyses performed on two different samples) is 16.27(0.15) P 2 O 5 , 18.82(0.18) SO 3 , 23.93(0.40) Al 2 O 3 , 1.53(0.17) Fe 2 O 3 and 40.05(0.19...
FIGURES | View All (6)
Journal Article
Published: 01 June 2005
The Canadian Mineralogist (2005) 43 (3): 1065–1075.
... an equal number of alternating layers of site one and two, whereas the (001) face has a 5:6 ratio of M (1): M (2) ( Wildner et al. 1996 ). The elongation in the c axis in the Co end-members may be explained if Co shows a preference to occupy M (2). Because M (2) is present in higher proportions...
FIGURES | View All (10)
Journal Article
Published: 01 August 2007
Vadose Zone Journal (2007) 6 (3): 407–435.
... and Langmuir isotherm equations, have been used to represent adsorption. The empirical approaches are not capable of accounting for the effects of variable chemical conditions, such as pH, on adsorption reactions. This can be done using chemical models such as surface complexation models. These models define...
FIGURES
Journal Article
Published: 01 July 2012
American Mineralogist (2012) 97 (7): 1206–1212.
... related to leucostaurite. For example in Na 0.5 Pb 2 (B 5 O 9 )Cl(OH) 0.5 , one type of channels contains Cl − ions, the other contains OH − , Cl − , and Na + ions; in leucostaurite these channels are occupied by Cl − ions, and Cl − ions + H 2 O groups, respectively. Chemical analyses were carried...
FIGURES
Journal Article
Journal: AAPG Bulletin
Published: 01 January 1946
AAPG Bulletin (1946) 30 (1): 32–51.
...C. W. Sheppard; W. L. Whitehead ABSTRACT In the experiments described, four members of the saturated fatty acid series are bombarded by the alpha particles from radon and its active deposit. The energy from the radiation causes principally chemical reaction resulting in formation of carbon dioxide...
FIGURES | View All (8)
Journal Article
Journal: Economic Geology
Published: 01 August 2000
Economic Geology (2000) 95 (5): 1129–1153.
... of emeralds. Rock-Eval analyses (hydrogen index <1; 19 < oxygen index < 61) as well the elemental H/C ratio (hydrogen index <1) confirmed the intense cracking suffered by the original organic matter. In hydrothermal bitumen, infrared microscopy revealed the absence of aliphatic and aromatic bands...
FIGURES | View All (13)
Journal Article
Published: 01 February 2010
Mineralogical Magazine (2010) 74 (1): 159–177.
... molecules lie inside tubes and channels of the structure. On the basis of microprobe analyses and occupancy refinement of the cation sites, the crystal chemical formula of this charoite can be written as ( Z = 1): (K 13.88 Sr 1.0 Ba 0.32 Mn 0.36 ) Σ15.56 (Ca 25.64 Na 6.36 ) Σ32 [(Si 6 O 11 (O,OH) 6 ) 2 (Si...
FIGURES | View All (12)
Journal Article
Published: 01 March 2003
European Journal of Mineralogy (2003) 15 (2): 257–266.
..., delimited by 8-membered tetrahedral rings, running parallel to the c -axis. Two adjacent channels are connected with each other along the a -axis by 10-membered rings of tetrahedra. The channels host mainly Ca cations and H 2 O molecules. Early investigations were conducted in the monoclinic C 2 / m...
FIGURES | View All (8)
Journal Article
Journal: Elements
Published: 01 June 2006
Elements (2006) 2 (3): 157–162.
... of which are nominally anhydrous minerals), they also found low δD values, consistent with a more Earth-like composition for the low δD end member. Gillet et al. ( 2002 ) analyzed secondary alteration in nakhlite NWA817 by SIMS and found only low, Earth-like values for δD. It is difficult to rule out...
FIGURES | View All (7)
Journal Article
Published: 01 August 2019
Russ. Geol. Geophys. (2019) 60 (8): 926–937.
... sequences of the phyla Bathyarchaeota (96.2%) and Diapherotrites (0.14%) as well as Thermoplasmata (3.2%) and Methanomicrobia (0.1%) classes representing the phylum Euryarchaeota (data not shown). The dominance of the members of the phyla Proteobacteria (α-, β-, γ-) and Actinobacteria...
FIGURES | View All (5)
Journal Article
Published: 01 March 2017
American Mineralogist (2017) 102 (3): 558–570.
... a mixture of both end-members. In this study, 12 typical samples (see Supplementary 1 Table 1 for IODP core information), with emphases on felsic lithologies, have been selected for detailed in situ micro-analyses on apatite. Seven samples were collected from depths close to the shallower gabbroic...
FIGURES | View All (10)
Journal Article
Journal: Clay Minerals
Published: 01 March 2011
Clay Minerals (2011) 46 (1): 25–45.
... computer program for illite+smectite from the Carpathian Foredeep and for end-member chemical compositions of other minerals. Mineral ρ (g cm –2 ) CEC (meqv/100 g) TSSA (m 2 g –1 ) Bound H 2 O (wt.%) Smectite 2.75–2.98 80–l20 800–740 15.3–16.5 Illite+glauconite 2.85...
FIGURES | View All (14)
Journal Article
Published: 01 October 2010
Clays and Clay Minerals (2010) 58 (5): 721–723.
... is in the form of H 3 O + . No reason exists to assume less water content in the IMt-2 sample than in those determined by Hower and Mowatt (1966) and confirmed by the thermogravimetric analyses of Nieto et al. (2010) . The comparison between element contents calculated from end-members and those from...
Journal Article
Published: 01 April 2009
American Mineralogist (2009) 94 (4): 622–625.
... calculations for the refined model show that the structure is chemically reasonable. In the refined structure, Mg 2+ cations are coordinated by four O atoms from [SO 4 ] 2− groups tetrahedra and by two H 2 O molecules, forming distorted octahedra. By sharing vertex O atoms, [SO 4 ] and [MgO 4 (H 2 O) 2...
FIGURES
Journal Article
Published: 01 January 2005
American Mineralogist (2005) 90 (1): 143–154.
... metal ions or alter the rates of important Mn oxide surface-mediated processes such as the degradation of organic molecules. It is plausible that microbes may exploit such mineral transformation reactions to indirectly control specific chemical conditions in the vicinity of the cell. Energy shifts...
FIGURES | View All (7)
Journal Article
Published: 01 April 2005
Mineralogical Magazine (2005) 69 (2): 155–167.
... austenite duftite SEM and EDX analyses FTIR Raman spectroscopy electronic reflectance spectroscopy C onichalcite , CaCuAsO 4 OH, forms in the oxidation zone of copper ore bodies. It is a member of the adelite group of minerals which also includes such species as austenite, adelite and duftite...
FIGURES | View All (7)
Journal Article
Published: 01 April 2007
American Mineralogist (2007) 92 (4): 587–597.
...)_{4}O_{2}\ +\ 3H^{+}\ =\ {\square}(OH_{2})_{3}(OH)O_{2}\ +\ Al^{3+}\] \end{document} forming water molecules coordinated to the Al atoms (Al D ) adjacent to the vacancy, i.e., Al D -OH 2 groups. However, an Al vacancy creates four terminal Al-OH groups, as illustrated in Figure 2...
FIGURES | View All (11)
Journal Article
Journal: AAPG Bulletin
Published: 15 April 2020
AAPG Bulletin (2020) 104 (4): 735–765.
... microscopy, scanning electron microscopy, cathodoluminescence, x-ray diffraction, chemical analysis of formation water, stable isotope analyses, and fluid inclusion examination. These analyses demonstrate that the late-stage charging of CO 2 -rich thermal fluid in the wells near the diapir zone modified...
FIGURES | View All (17)
Journal Article
Published: 01 September 2003
European Journal of Mineralogy (2003) 15 (5): 903–911.
... in the literature about phase transitions in pyroxenes end-members in order to analyse topology changes in these compounds while changing T and P. His data show that each phase transition is coupled with a change in coordination of the M2 site. This is in line with the observations of Sueno et al. (1984...
FIGURES
Journal Article
Journal: Economic Geology
Published: 01 December 2013
Economic Geology (2013) 108 (8): 1983–2003.
... a New-Wave Research UP213 Nd-YAG (213 nm) laser coupled to an Agilent 7500a quadrupole mass-spectrometer; analyses were performed by ablating 100-μm -diam spots at a rate of 10 shots/sec; data reduction was undertaken according to standard methods ( Longerich et al., 1996 ), using NIST612 glass...
FIGURES | View All (10)