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![Selected samples of derbylite and <span class="search-highlight">graeserite</span> from the Monte Arsiccio mine. ...]()
![The octahedral framework characterising derbylite and <span class="search-highlight">graeserite</span>, as seen d...]()
![Hyperfine parameters for fitted doublets in the Mössbauer spectra of derbyl...]()
![Mössbauer spectra of derbylite (upper) and <span class="search-highlight">graeserite</span> (lower).]()
![Chemical variability in derbylite (light blue diamonds) and <span class="search-highlight">graeserite</span> (red...]()
![Studied samples of derbylite (A–D) and <span class="search-highlight">graeserite</span> (E–G). Label ...]()
![Selected bond distances (in Å) for <span class="search-highlight">graeserite</span>. Sample F ...]()
![Weighted bond-valence sums (in vu) for <span class="search-highlight">graeserite</span>. Site O(...]()
![Coordination of the extraframework cations in the cube-octahedral cavities ...]()
![Hypothetical ordered sequences within the cuboctahedral cavities of graeser...]()
![Crystal data and summary of parameters describing data collection and refin...]()
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![Refined site scattering vs . calculated site scattering (in electrons), pr...]()
![Atomic coordinates, site occupation factors (s.o.f.), and equivalent isotro...]()
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graeserite
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Journal Article
Derbylite and graeserite from the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy: occurrence and crystal-chemistry
Journal: Mineralogical Magazine
Published: 01 September 2020
Mineralogical Magazine (2020) 84 (5): 766–777.
...Cristian Biagioni; Elena Bonaccorsi; Natale Perchiazzi; Ulf Hålenius; Federica Zaccarini Abstract New occurrences of derbylite, Fe x 2+ Fe 3+ 4–2 x Ti 4+ 3+ x Sb 3+ O 13 (OH), and graeserite, Fe x 2+ Fe 3+ 4–2 x Ti 4+ 3+ x As 3+ O 13 (OH), have been identified in the Monte Arsiccio mine, Apuan Alps...
FIGURES
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Journal Article
Graeserite, Fe 4 Ti 3 AsO 13 (OH), a new mineral species of the derbylite group from the Monte Leone Nappe, Binntal region, Western Alps, Switzerland
Journal: The Canadian Mineralogist
Publisher: Mineralogical Association of Canada
Published: 01 August 1998
The Canadian Mineralogist (1998) 36 (4): 1083–1088.
Image
Selected samples of derbylite and graeserite from the Monte Arsiccio mine. ...
in Derbylite and graeserite from the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy: occurrence and crystal-chemistry
> Mineralogical Magazine
Published: 01 September 2020
Fig. 1. Selected samples of derbylite and graeserite from the Monte Arsiccio mine. ( a ) Black prismatic crystal of derbylite, deeply striated, with siderite, baryte and ‘hyalophane’. ( b ) Black acicular crystal of derbylite with magnetite, siderite, ‘hyalophane’ and quartz. ( c ) Aggregate
Image
The octahedral framework characterising derbylite and graeserite, as seen d...
in Derbylite and graeserite from the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy: occurrence and crystal-chemistry
> Mineralogical Magazine
Published: 01 September 2020
Fig. 4. The octahedral framework characterising derbylite and graeserite, as seen down a ( a ) and its constitutive V 3 O 5 -type ( b ) and α-PbO 2 -type ( c ) octahedral columns. The axial setting of graeserite was used.
Image
Hyperfine parameters for fitted doublets in the Mössbauer spectra of derbyl...
in Derbylite and graeserite from the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy: occurrence and crystal-chemistry
> Mineralogical Magazine
Published: 01 September 2020
Table 3. Hyperfine parameters for fitted doublets in the Mössbauer spectra of derbylite (sample C) and graeserite (sample F). CS (mm/s) QS (mm/s) FWHM (mm/s) Int. (%) Derbylite (Sample C) Fe 3+ 0.42(2) 0.54(5) 0.48(1) 81(2) Fe 2+ 0.94(12) 1.58(24) 0.54
Image
Mössbauer spectra of derbylite (upper) and graeserite (lower).
in Derbylite and graeserite from the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy: occurrence and crystal-chemistry
> Mineralogical Magazine
Published: 01 September 2020
Fig. 2. Mössbauer spectra of derbylite (upper) and graeserite (lower).
Image
Chemical variability in derbylite (light blue diamonds) and graeserite (red...
in Derbylite and graeserite from the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy: occurrence and crystal-chemistry
> Mineralogical Magazine
Published: 01 September 2020
Fig. 3. Chemical variability in derbylite (light blue diamonds) and graeserite (red triangles) samples from the Monte Arsiccio mine.
Image
Studied samples of derbylite (A–D) and graeserite (E–G). Label ...
in Derbylite and graeserite from the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy: occurrence and crystal-chemistry
> Mineralogical Magazine
Published: 01 September 2020
Table 1. Studied samples of derbylite (A–D) and graeserite (E–G). Label Occurrence Description Associated minerals A Siderite + baryte veins in magnetite-rich metadolostone Black prismatic crystals, deeply striated Baryte, boulangerite, galena, ‘hyalophane’, siderite
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Selected bond distances (in Å) for graeserite. Sample F ...
in Derbylite and graeserite from the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy: occurrence and crystal-chemistry
> Mineralogical Magazine
Published: 01 September 2020
Table 10. Selected bond distances (in Å) for graeserite. Sample F M (1)–O(5) 1.971(8) ×2 M (2)–O(2) 1.921(6) ×2 M (1)–O(1) 1.986(6) ×4 M (2)–O(1) 2.027(6) ×2 <M–O> 1.981 M (2)–O(5) 2.159(5) ×2 <M(2)–O> 2.036 M (3)–O(1) 1.887(6
Image
Weighted bond-valence sums (in vu) for graeserite. Site O(...
in Derbylite and graeserite from the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy: occurrence and crystal-chemistry
> Mineralogical Magazine
Published: 01 September 2020
Table 12. Weighted bond-valence sums (in vu) for graeserite. Site O(1) O(2) O(3) O(4) O(5) Σcations Theoretical Sample F M (1) 3x→ 0.61 3x→ 0.64 3.75 3.80 M (2) 2x→ 0.50 2x→ 0.66 2x→ 0.35 ↓×2 3.02 3.00 M (3) 0.77 0.66, 0.62
Image
Coordination of the extraframework cations in the cube-octahedral cavities ...
in Batisivite, the first silicate related to the derbylite-hemloite group
> European Journal of Mineralogy
Published: 01 October 2008
Fig. 5. Coordination of the extraframework cations in the cube-octahedral cavities in the structures of batisivite, graeserite, tomichite and barian tomichite, and derbylite; small white spheres represent oxygen atoms.
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Hypothetical ordered sequences within the cuboctahedral cavities of graeser...
in Derbylite and graeserite from the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy: occurrence and crystal-chemistry
> Mineralogical Magazine
Published: 01 September 2020
Fig. 5. Hypothetical ordered sequences within the cuboctahedral cavities of graeserite. Symbols: large circle represents Ba; medium circle is As; and small circles are O sites. The O(5) site is highlighted and it is shown as light blue circles. For the sake of completeness, labels of the other O
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Crystal data and summary of parameters describing data collection and refin...
in Derbylite and graeserite from the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy: occurrence and crystal-chemistry
> Mineralogical Magazine
Published: 01 September 2020
Table 4. Crystal data and summary of parameters describing data collection and refinement for derbylite and graeserite. Crystal data Sample Derbylite (sample C) Graeserite (sample F) Graeserite (sample G) Crystal size (mm) 0.11 × 0.08 × 0.07 0.07 × 0.05 × 0.03
Journal Article
Batisivite, the first silicate related to the derbylite-hemloite group
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 October 2008
European Journal of Mineralogy (2008) 20 (5): 975–981.
...Fig. 5. Coordination of the extraframework cations in the cube-octahedral cavities in the structures of batisivite, graeserite, tomichite and barian tomichite, and derbylite; small white spheres represent oxygen atoms. ...
FIGURES
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Journal Article
Bianchiniite, Ba 2 (Ti 4+ V 3+ )(As 2 O 5 ) 2 OF, a new diarsenite mineral from the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy
Journal: Mineralogical Magazine
Published: 22 March 2021
Mineralogical Magazine (2021) 85 (3): 354–363.
..., derbylite, graeserite, siderite, dolomite, ankerite and quartz. Usually, crystals of bianchiniite are deeply altered to an X-ray amorphous earthy material ( Fig. 1 ), in some cases admixed with microcrystalline rutile; in the second additional identified specimen, a relict of bianchiniite was observed...
FIGURES
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Journal Article
Anthony, J.W., Bideaux, R.A., Bladh, K.W. and Nichols, M.C. Handbook of Mineraiogy, Volume 4, Arsenates, Phosphates, Vanadates : Tucson, Arizona, Mineral Data Publishing, 2000, 680 pp. Price US$108. ISBN 0 9622097 3 2.
Journal: Mineralogical Magazine
Published: 01 February 2001
Mineralogical Magazine (2001) 65 (1): 152–153.
..., bederite, brendelite, kastningite, parascorodite and wooldridgeite are included, but andyrobertsite, bariosincosite, calcioandyrobertsite, chadwickite, graeserite, schä ferite and springcreekite, and of course species published or revised in 2000 are not. There are no crystal drawings, photographs...
Journal Article
THE CRYSTAL STRUCTURE OF CERVANDONITE-(Ce), AN INTERESTING EXAMPLE OF As 3+ → Si DIADOCHY
Journal: The Canadian Mineralogist
Publisher: Mineralogical Association of Canada
Published: 01 April 2008
The Canadian Mineralogist (2008) 46 (2): 423–430.
..., and graeserite, and even arsenite-silicates such as asbecasite ( Graeser 1966 , Cannillo et al. 1969 , Edenharter et al . 1977 , Graeser et al . 1994 , Krzemnicki & Reusser 1998 , Berlepsch & Armbruster 1998 ). The positions of the silicon atoms in cervandonite- (Ce) are sufficiently...
FIGURES
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Journal Article
MGM volume 84 issue 5 Cover and Back matter
Journal: Mineralogical Magazine
Published: 01 October 2020
Mineralogical Magazine (2020) 84 (5): b1–b2.
... ZACCARINI: Derbylite and graeserite from the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy: occurrence and crystal-chemistry 766 MICHAEL S. RUMSEY, MARK D. WELCH, JOHN SPRATT and ANNETTE K. KLEPPE : Grguricite, CaCr2(CO3)2(OH)4.4H2O, a new alumohydrocalcite analogue 778 TING LI, ZIYING LI, GUANG FAN...
Image
Refined site scattering vs . calculated site scattering (in electrons), pr...
in Derbylite and graeserite from the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy: occurrence and crystal-chemistry
> Mineralogical Magazine
Published: 01 September 2020
Table 11. Refined site scattering vs . calculated site scattering (in electrons), proposed site population, observed and calculated average distances (Å) for graeserite. Site Refined site scattering Proposed site population Calculated site scattering < M –O> obs < M
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Atomic coordinates, site occupation factors (s.o.f.), and equivalent isotro...
in Derbylite and graeserite from the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy: occurrence and crystal-chemistry
> Mineralogical Magazine
Published: 01 September 2020
Table 9. Atomic coordinates, site occupation factors (s.o.f.), and equivalent isotropic or isotropic(*) displacement parameters (Å 2 ) for graeserite. Site Wyckoff position s.o.f. x y z U eq/iso Sample F M (1) 2 d Ti 1.00 0 ½ ½ 0.0102(8
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