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greenalite

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Journal Article
Journal: GSA Bulletin
Published: 01 March 2016
GSA Bulletin (2016) 128 (3-4): 511-530.
... Fe(II)-silicate gel at 25 °C. By merging experimental data with crystallographic constraints, we observe that structural rearrangement and dehydration produce Fe-rich serpentine nanoparticles within the gel, which eventally aggregate to form the mineral greenalite. This nonclassical crystal growth...
FIGURES | View All (13)
Journal Article
Published: 01 February 1998
The Canadian Mineralogist (1998) 36 (1): 147-162.
...) , and the greenalite and minnesotaite are correspondingly Fe-rich. No grunerite has been found. The paragenetic sequence fayalite-->greenalite-->minnesotaite-->quartz represents infiltration at approximately 300 degrees C of an initially very reducing, Fe-rich hydrothermal fluid that became progressively more...
Journal Article
Published: 01 February 1998
The Canadian Mineralogist (1998) 36 (1): 163-179.
...Stephen Guggenheim; Richard A. Eggleton Abstract High-resolution transmission electron microscope (TEM) images confirm that greenalite and caryopilite are modulated 1:1 phyllosilicates. The octahedrally coordinated Fe (greenalite) and Mn (caryopilite) form trioctahedral sheets. Six-member rings...
Journal Article
Published: 01 June 1989
American Mineralogist (1989) 74 (5-6): 637-641.
... phases. The 7-Å phases include atleast two polytypes (group A and either group B, C, or D) of lizardite and a modulated 1:1 layersilicate similar to those of the greenalite-caryopilite series. The 14-Å phase includes a dominant chlorite- Ibb structure. A chrysotile-likephase is present also, although...
Journal Article
Published: 01 February 1982
The Canadian Mineralogist (1982) 20 (1): 1-18.
Journal Article
Published: 01 November 1974
The Canadian Mineralogist (1974) 12 (7): 475-498.
Journal Article
Published: 01 July 1936
American Mineralogist (1936) 21 (7): 449-455.
...John W. Gruner Abstract More than two years ago the writer made an x -ray examination of greenalite from the iron formation of the Mesabi Range in Minnesota. It was noticed that the powder of greenalite gave a definite pattern on which that of quartz was superimposed. The pattern did not resemble...
Journal Article
Published: 01 June 1935
American Mineralogist (1935) 20 (6): 405-425.
...Fred Jolliffe Abstract The mineral greenalite occurs in the Biwabik iron formation of Minnesota. It is an iron silicate and possesses a granular structure akin to that of the cherty iron formations which make up the greater part of the Biwabik. Both composition and structure have suggested...
Journal Article
Journal: GSA Bulletin
Published: 01 January 1912
GSA Bulletin (1912) 23 (1): 329-332.
Journal Article
Published: 01 February 1980
American Mineralogist (1980) 65 (1-2): 8-25.
...M. J. Gole Abstract There are two basic Fe-rich lithologies at Weld Range: (1) banded iron-formation containing minnesotaite, siderite, quartz, magnetite, greenalite, stilpnomelane, pyrite, and chamosite with trace amounts of pyrrhotite, arsenopyrite, chalcopyrite, apatite, and rockbridgeite; (2...
Series: Society of Exploration Geophysicists Geophysical Monograph Series
Published: 01 January 2003
DOI: 10.5382/Mono.11.23
EISBN: 9781629490069
..., and greenalite; siderite, quartz, minnesotaite, ferropyrosmalite, and sphalerite are generally minor. Like stage II deposits, those of stage IV are significantly enriched in Co and Se, relative to stage I deposits. Stage IV also developed by subsea-floor zone refining, superimposed on older stages as veins...
FIGURES | View All (23)
Image
<b>Greenalite</b> precipitation versus Fe(II) oxidation rates as function of  p O ...
in > Geology
Published: 02 May 2019
Figure 4. Greenalite precipitation versus Fe(II) oxidation rates as function of p O 2 and pH for 100 µmol/kg Fe 2+ . Brown curves below green line (shaded light green) represent p O 2 values at which rate of greenalite precipitation exceeds that of Fe(II) oxidation. Red shading above green
Image
Images of finely laminated chert containing <b>greenalite</b> nanoparticles from H...
in > Geology
Published: 08 January 2019
Figure 1. Images of finely laminated chert containing greenalite nanoparticles from Hamersley Group (Australia) and Transvaal Supergroup (South Africa) banded iron formations (BIFs) and cherts. A: Polished thin section of finely laminated chert. B,C: Plane-polarized light (PPL; B) and cross
Image
A: Backscattered electron (BSE) image of abundant <b>greenalite</b> particles (lig...
in > Geology
Published: 08 January 2019
Figure 2. A: Backscattered electron (BSE) image of abundant greenalite particles (light gray) in fine-grained chert cement (medium gray). B: High-angle annular dark field (HAADF) scanning transmission electron microscope (STEM) image of focused ion beam (FIB) foil cut from greenalite-rich chert
Image
Schematic of the <b>greenalite</b> structure, illustrating long-range disorder of ...
Published: 01 March 2016
Figure 7. Schematic of the greenalite structure, illustrating long-range disorder of the tetrahedral sheet, which is composed of tetrahedral islands, or domains, and completely disordered (i.e., glass-like) interisland regions. The nature and positions of disordered Si-tetrahedra
Image
Schematic of the nucleation and growth mechanism of <b>greenalite</b> from anoxic ...
Published: 01 March 2016
Figure 8. Schematic of the nucleation and growth mechanism of greenalite from anoxic seawater. The initial association of Fe 2+ and dissolved Si leads to the rapid precipitation of a hydrous, disordered Fe 2+ -silicate (or “gel”) phase chemically identical to, but structurally distinct from
Image
(A) Interbedded wavy laminated magnetite-<b>greenalite</b> mudstone (dark green) a...
Published: 01 March 2016
Figure 11. (A) Interbedded wavy laminated magnetite-greenalite mudstone (dark green) and rippled chert grainstone (light green). Anoxic middle shelf setting, Paleoproterozoic Sokoman Formation, Labrador Trough, Canada. (B) Acicular greenalite on reworked authigenic grains of sedimentary apatite
Image
(A–B) Relationship between <b>greenalite</b> and siderite solubilities in determin...
Published: 01 March 2016
Figure 13. (A–B) Relationship between greenalite and siderite solubilities in determining maximum Fe 2+ levels of nonsulfidic anoxic marine systems. In order for greenalite to precipitate, the corresponding solubility line must be crossed. However, in order for greenalite to occur without
Image
Laminated white chert bed containing clusters of <b>greenalite</b> inclusions. (A)...
Published: 01 September 2014
Figure 6. Laminated white chert bed containing clusters of greenalite inclusions. (A) Scanned image of polished thin section of laminated white chert with rotated fragments of tabular chert (see arrow). (B) Transmitted light (TL) image of part of A (see inset) showing laminated chert
Image
Stability fields of berthierine, <b>greenalite</b> and chert as a function of acti...
Published: 01 December 2001
Figure 14. Stability fields of berthierine, greenalite and chert as a function of activities of Si and Al complexes in water systems. After Maynard (1983) , with additional data (18 analyses) for mainly metalliferous hot geothermal waters and brines, compiled from Ellis (1967) , White (1967