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eckermannite

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Journal Article
Published: 01 April 2015
American Mineralogist (2015) 100 (4): 909–914.
... of eckermannite, re-examination of the holotype material of eckermannite deposited at the Museum of Natural History in London (BM 1949.151) and of the original sample analyzed by Törnebohm (1906) confirmed that they both are actually fluoro-leakeite. A survey of literature data showed that the only analysis...
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Journal Article
Published: 01 October 1987
American Mineralogist (1987) 72 (9-10): 959–964.
...Mati Raudsepp; Allen C. Turnock; Frank C. Hawthorne Abstract Characterization of cation order-disorder relationships in synthetic amphiboles is essential for the proper interpretation of physical and thermodynamic properties. In this study, scandium-fluor-eckermannite, indium-fluor-eckermannite...
Journal Article
Published: 10 August 2023
Mineralogical Magazine (2023) 87 (6): 935–942.
...Anatoly V. Kasatkin; Natalia V. Zubkova; Atali A. Agakhanov; Nikita V. Chukanov; Radek Škoda; Fabrizio Nestola; Dmitry I. Belakovskiy; Igor V. Pekov Abstract Mangani-eckermannite, ideally NaNa 2 (Mg 4 Mn 3+ )Si 8 O 22 (OH) 2 , is a new member of the amphibole supergroup found at Tanohata Mine...
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Journal Article
Published: 01 June 2018
American Mineralogist (2018) 103 (6): 989–992.
...Harriet Howe; Alison R. Pawley; Mark D. Welch Abstract An amphibole close to eckermannite in composition, ideally Na 3 Mg 4 AlSi 8 O 22 (OH) 2 , was encountered in experiments on a bulk composition close to that of glaucophane at 6.2 GPa, ∼550–650 °C. The synthetic amphibole has an average...
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Published: 01 January 2013
EISBN: 9780903056434
.... Eckermannite occurs in alkaline igneous rocks such as nepheline syenites, accompanied by aegirine. It is typically bluish green in colour in contrast to arfvedsonite which is commonly deep blue to yellow brown. Arfvedsonite occurs in peralkaline granites and syenites. Chemistry Sodium amphiboles...
Journal Article
Published: 01 February 1999
American Mineralogist (1999) 84 (1-2): 102–111.
...Roberta Oberti; Frank C. Hawthorne; Fernando Camara; Mati Raudsepp Single-crystal structure-refinement and electron-microprobe analysis of synthetic amphiboles with nominal fluoro-eckermannite composition and different trivalent cations (Al, Sc, Ti (super 3+) , V (super 3+) , Cr (super 3+) , Ga...
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Comparative data for mangani-<span class="search-highlight">eckermannite</span>, <span class="search-highlight">eckermannite</span> and magnesio-arfved...
Published: 10 August 2023
Table 8. Comparative data for mangani-eckermannite, eckermannite and magnesio-arfvedsonite. *For the type specimen described by Oberti et al. ( 2015a )
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( a ) Secondary-electron image of <span class="search-highlight">eckermannite</span> crystals from Experiment 2 (...
Published: 01 June 2018
Figure 2. ( a ) Secondary-electron image of eckermannite crystals from Experiment 2 (6.2 GPa, 580–670 °C). ( b ) Bright-field HRTEM image of an eckermannite crystal from Experiment 1 (6.2 GPa, 510–620 °C) viewed along a * and showing (0 k 0) fringes, showing the characteristic amphibole double
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Powder infrared absorption spectrum of mangani-<span class="search-highlight">eckermannite</span>.
Published: 10 August 2023
Figure 3. Powder infrared absorption spectrum of mangani-eckermannite.
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Selected interatomic distances (in Å) in the crystal structure of mangani-e...
Published: 10 August 2023
Table 5. Selected interatomic distances (in Å) in the crystal structure of mangani-eckermannite.
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Powder X-ray diffraction data ( d  in Å) of mangani-<span class="search-highlight">eckermannite</span>.
Published: 10 August 2023
Table 2. Powder X-ray diffraction data ( d in Å) of mangani-eckermannite.
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Compositions of phases relevant to <span class="search-highlight">eckermannite</span> and glaucophane stability a...
Published: 01 June 2018
Figure 1. Compositions of phases relevant to eckermannite and glaucophane stability at high pressure. Projection from SiO 2 and H 2 O onto Na 2 O-MgO-Al 2 O 3 . Abbreviations: ap = aspidolite, ek = eckermannite, en = enstatite, gp = glaucophane, jd = jadeite, mk = Mg-katophorite, ny = nyboite
Journal Article
Published: 01 December 2004
The Canadian Mineralogist (2004) 42 (6): 1799–1823.
... age. The dykes are composed of pyroxene, nepheline, analcime, devitrified glass, magnetite, phillipsite-Na, magnesiokatophorite, eckermannite, biotite, calcite and chlorite. The pyroxene is strongly zoned, with compositions grouped about four different Mg# values (80, 70, 55 and 20), showing...
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Anhedral grains of mangani-<span class="search-highlight">eckermannite</span> (Meck) closely intergrown with brau...
Published: 10 August 2023
Figure 2. Anhedral grains of mangani-eckermannite (Meck) closely intergrown with braunite (Bnt), albite (Ab) and vittinkiite (Vtk). Polished section. Back-scattered electron image.
Journal Article
Published: 01 February 1987
American Mineralogist (1987) 72 (1-2): 126–136.
... with jadeite and significant solid solution with omphacite are observed. Minor Ur content is found in jadeitic diopside from a chromite-bearing diopside rock from California and in jadeite and omphacite associated with jadeitites from Guatemala. The relatively uncommon amphiboles eckermannite and nyboite...
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Site occupancies proposed for mangani-<span class="search-highlight">eckermannite</span> based on the results of ...
Published: 10 August 2023
Table 7. Site occupancies proposed for mangani-eckermannite based on the results of the crystal structure refinement. SSF exp and SSF calc are the experimental and calculated site-scattering factors normalised to unity, respectively.
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A 0.7 cm thick vein consisting of dark red mangani-<span class="search-highlight">eckermannite</span> intergrown ...
Published: 10 August 2023
Figure 1. A 0.7 cm thick vein consisting of dark red mangani-eckermannite intergrown with black braunite, pink vittinkiite and colourless albite in a rock mainly consisting of colourless to pale salmon-reddish quartz. Holotype sample #5774/1, size: 2 × 1.5 × 1.5 cm. Photo: M. Milshina.
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Raman spectrum of mangani-<span class="search-highlight">eckermannite</span> excited by a 532 nm laser: in the 10...
Published: 10 August 2023
Figure 4. Raman spectrum of mangani-eckermannite excited by a 532 nm laser: in the 100–1250 cm –1 region and in the 2500–4000 cm –1 region (inset in the upper right corner). The measured spectrum is shown by dots. The curve matched to the dots is a result of spectral fit as a sum of individual
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Chemical composition of mangani-<span class="search-highlight">eckermannite</span>.       *Apportioned from 19.24...
Published: 10 August 2023
Table 1. Chemical composition of mangani-eckermannite. *Apportioned from 19.24 wt.% MnO measured by electron microprobe analysis **For total Mn calculated as MnO. ***Calculated from 0.172 wt.% H (mean of 5 spots; range 0.170–0.174; S.D. 0.002) determined by SIMS. S.D. = Standard
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BSE images of samples from the Ena dike illustrating: (a) core–rim texture ...
Published: 24 March 2023
as inclusions in phlogopite; K-feldspar in the groundmass; (d) katophorite replacing diopside phenocrysts; zoned amphibole (katophorite–nybøite) and K-feldspar occur in the groundmass; ilmenite inclusion in phlogopite; (e) zoned subhedral to euhedral apatite, zoned amphibole (eckermannite–arfvedsonite), and K