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stefanweissite

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Journal Article

Zirconolite from Larvik Plutonic Complex, Norway, its relationship to stefanweissite and nöggerathite, and contribution to the improvement of zirconolite end-member systematics Available to Purchase

Jakub Haifler, Radek Škoda, Jan Filip, Alf Olav Larsen, Jan Rohlíček
Published: 01 August 2021
American Mineralogist (2021) 106 (8): 1255–1272.
DOI: https://doi.org/10.2138/am-2021-7510
...+ = Ca + 3 Me 5+ + Me 2+ ), and Stålaker-type mode (0.7 ACT + 0.5 REE + 0.9 Ti + 0.7 Me 3+ + 0.05 Zr = 1.2 Ca + 1.3 Me 5+ + 0.3 Me 2+ + 0.05 Mn). In terms of chemical composition, the studied zirconolite corresponds to recently approved zirconolite-related minerals stefanweissite (for Ca > REE...
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View PDF for article title, Zirconolite from Larvik Plutonic Complex, Norway, its relationship to <span class="search-highlight">stefanweissite</span> and nöggerathite, and contribution to the improvement of zirconolite end-member systematics
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Journal Article

Stefanweissite, (Ca, REE ) 2 Zr 2 (Nb,Ti)(Ti,Nb) 2 Fe 2+ O 14 , a new zirconolite-related mineral from the Eifel paleovolcanic region, Germany Available to Purchase

Nikita V. Chukanov, Natalia V. Zubkova, Igor V. Pekov, Marina F. Vigasina, Yury S. Polekhovsky, Bernd Ternes, Willi Schüller, Sergey N. Britvin, Dmitry Yu. Pushcharovsky
Published: 21 January 2019
Mineralogical Magazine (2019) 83 (4): 607–614.
DOI: https://doi.org/10.1180/mgm.2018.171
...Nikita V. Chukanov; Natalia V. Zubkova; Igor V. Pekov; Marina F. Vigasina; Yury S. Polekhovsky; Bernd Ternes; Willi Schüller; Sergey N. Britvin; Dmitry Yu. Pushcharovsky Abstract The new mineral stefanweissite, IMA2018-020, was discovered in sanidinite volcanic ejecta from the Laach Lake (Laacher...
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View PDF for article title, <span class="search-highlight">Stefanweissite</span>, (Ca, REE ) 2 Zr 2 (Nb,Ti)(Ti,Nb) 2 Fe 2+ O 14 , a new zirconolite-related mineral from the Eifel paleovolcanic region, Germany
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Ratios of large VIIIM1 cations in orthorhombic zirconolite-type minerals from the Laach Lake volcano: the holotype stefanweissite (black square); other stefanweissite samples (open squares); and nöggerathite-(Ce) (open circles – our data; black circle – analysis 1 from Della Ventura et al., 2000).

Ratios of large VIII M 1 cations in orthorhombic zirconolite-type mineral... Available to Purchase

Published: 21 January 2019
Fig. 5. Ratios of large VIII M 1 cations in orthorhombic zirconolite-type minerals from the Laach Lake volcano: the holotype stefanweissite (black square); other stefanweissite samples (open squares); and nöggerathite-(Ce) (open circles – our data; black circle – analysis 1 from Della Ventura
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Raman spectrum of stefanweissite.

Raman spectrum of stefanweissite. Available to Purchase

Published: 21 January 2019
Fig. 2. Raman spectrum of stefanweissite.
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[100] projection of the stefanweissite structure showing sawtooth layers of corner-connected octahedra.

[100] projection of the stefanweissite structure showing sawtooth layers of... Available to Purchase

Published: 14 April 2021
Fig. 5. [100] projection of the stefanweissite structure showing sawtooth layers of corner-connected octahedra.
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The crystal structure of stefanweissite: general view. The unit cell is outlined. For legend see Fig. 3.

The crystal structure of stefanweissite: general view. The unit cell is out... Available to Purchase

Published: 21 January 2019
Fig. 4. The crystal structure of stefanweissite: general view. The unit cell is outlined. For legend see Fig. 3 .
Journal Article

Redefinition of the formula for aldermanite, [Mg(H 2 O) 6 ][Na(H 2 O) 2 Al 3 (PO 4 ) 2 (OH,F) 6 ]⋅H 2 O, and its crystal structure Available to Purchase

Peter Elliott, Ian E. Grey, Anthony C. Willis
Published: 14 April 2021
Mineralogical Magazine (2021) 85 (3): 348–353.
DOI: https://doi.org/10.1180/mgm.2021.36
...Fig. 5. [100] projection of the stefanweissite structure showing sawtooth layers of corner-connected octahedra. ...
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View PDF for article title, Redefinition of the formula for aldermanite, [Mg(H 2 O) 6 ][Na(H 2 O) 2 Al 3 (PO 4 ) 2 (OH,F) 6 ]⋅H 2 O, and its crystal structure
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Crystallographic parameters for aldermanite, walentaite and stefanweissite.... Available to Purchase

Published: 14 April 2021
Table 5. Crystallographic parameters for aldermanite, walentaite and stefanweissite. Aldermanite Walentaite Stefanweissite Formula [Mg(H 2 O) 6 ] [Na(H 2 O) 2 Al 3 (PO 4 ) 2 (OH,F) 6 ]⋅H 2 O [Mn 2+ (H 2 O) 6 ] [ ${\rm As}_3^{3 + }$ O ${\rm Fe}_3^{3 + }$ (PO 4 ) 2 O
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Crystallographic parameters for aldermanite, walentaite and stefanweissite.... Available to Purchase

Published: 14 April 2021
Table 5. Crystallographic parameters for aldermanite, walentaite and stefanweissite. Aldermanite Walentaite Stefanweissite Formula [Mg(H 2 O) 6 ] [Na(H 2 O) 2 Al 3 (PO 4 ) 2 (OH,F) 6 ]⋅H 2 O [Mn 2+ (H 2 O) 6 ] [ ${\rm As}_3^{3 + }$ O ${\rm Fe}_3^{3 + }$ (PO 4 ) 2 O
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Crystallographic parameters for aldermanite, walentaite and stefanweissite.... Available to Purchase

Published: 14 April 2021
Table 5. Crystallographic parameters for aldermanite, walentaite and stefanweissite. Aldermanite Walentaite Stefanweissite Formula [Mg(H 2 O) 6 ] [Na(H 2 O) 2 Al 3 (PO 4 ) 2 (OH,F) 6 ]⋅H 2 O [Mn 2+ (H 2 O) 6 ] [ ${\rm As}_3^{3 + }$ O ${\rm Fe}_3^{3 + }$ (PO 4 ) 2 O
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Octahedral (a) and large-cation (b) layers and arrangement of Fe-dominant sites M5 and M6 inside the octahedral layer (c) in the structure of stefanweissite.

Octahedral ( a ) and large-cation ( b ) layers and arrangement of Fe-domina... Available to Purchase

Published: 21 January 2019
Fig. 3. Octahedral ( a ) and large-cation ( b ) layers and arrangement of Fe-dominant sites M 5 and M 6 inside the octahedral layer ( c ) in the structure of stefanweissite.
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Aggregates of brown lath- and needle-shaped crystals of stefanweissite on sanidine, in association with biotite (a, c) and magnetite (b). Photographer: Stefan Wolfsried. Field of view widths: (a) 1 mm; (b) 1.5 mm; (c) 0.8 mm; and (d) 2 mm.

Aggregates of brown lath- and needle-shaped crystals of stefanweissite on s... Available to Purchase

Published: 21 January 2019
Fig. 1. Aggregates of brown lath- and needle-shaped crystals of stefanweissite on sanidine, in association with biotite ( a , c ) and magnetite ( b ). Photographer: Stefan Wolfsried. Field of view widths: ( a ) 1 mm; ( b ) 1.5 mm; ( c ) 0.8 mm; and ( d ) 2 mm.
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Reflectance values ( R max / R min ) for stefanweissite. λ (nm) ... Available to Purchase

Published: 21 January 2019
Table 1. Reflectance values ( R max / R min ) for stefanweissite. λ (nm) R max R min λ (nm) R max R min 400 16.6 15.5 560 15.4 14.1 420 16.4 15.2 580 15.2 14.0 440 16.2 15.0 589 15.2 13.89 460 16.1 14.8 600 15.1 13.8 470
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Powder X-ray diffraction data for stefanweissite. I obs I cal... Available to Purchase

Published: 21 January 2019
Table 3. Powder X-ray diffraction data for stefanweissite. I obs I calc * d obs d calc ** h k l 4 2 4.121 4.129 0 2 2 8 12 3.682 3.689 1 3 1 4 2 3.335 3.340 0 4 1 100 100 2.983 2.963 2 0 2 71 93 2.897 2.903 0 4 2
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Selected interatomic distances (Å) in the structure of stefanweissite. ... Available to Purchase

Published: 21 January 2019
Table 6. Selected interatomic distances (Å) in the structure of stefanweissite. M 1–O3 2.388(3) × 2 M 2–O4 2.092(4) M 3–O1 1.964(3) × 4 M 1–O4 2.440(3) × 2 M 2–O2 2.126(3) × 2 M 3–O4 2.044(5) × 2 M 1–O1 2.490(3) × 2 M 2–O3 2.132(5) < M 3–O> 1.991
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Comparative data for stefanweissite and related minerals. Mineral ... Available to Purchase

Published: 21 January 2019
Table 7. Comparative data for stefanweissite and related minerals. Mineral Stefanweissite Nöggerathite-(Ce) Zirconolite-3 O Laachite Idealised formula (Ca, REE ) 2 Zr 2 (Nb,Ti) (Ce,Ca) 2 Zr 2 (Nb,Ti) CaZrTi 2 O 7 Ca 2 Zr 2 Nb 2 TiFeO 14 (Ti,Nb) 2 Fe 2+ O 14 (Ti,Nb) 2
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Chemical composition of stefanweissite. Constituent Wt.% Range S... Available to Purchase

Published: 21 January 2019
Table 2. Chemical composition of stefanweissite. Constituent Wt.% Range S.D. Standard CaO 7.63 6.53–8.52 0.69 Wollastonite MnO 2.51 2.07–2.80 0.29 MnTiO 3 FeO 7.86 6.97–8.68 0.57 Fe Al 2 O 3 0.25 0–0.53 0.22 Albite La 2 O 3 2.28 1.85–2.74 0.31
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Compositions of zirconolite from the LPC projected in the ternary plots involving elements assumed to occupy the M[VIII] (a) and M[VI,V,IV] (b) sites, and their comparison with other occurrences worldwide. The Ca vertex represents Ca + [VIII]Mn in the cases of laachite, stefanweissite, nöggerathite, and zirconolite-3T from Laacher See using structural models of Chukanov et al. (2014, 2018, 2019) and Zubkova et al. (2018). (Color online.)

Compositions of zirconolite from the LPC projected in the ternary plots inv... Available to Purchase

Published: 01 August 2021
, stefanweissite, nöggerathite, and zirconolite-3 T from Laacher See using structural models of Chukanov et al. (2014 , 2018 , 2019 ) and Zubkova et al. (2018) . (Color online.)
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X-ray powder diffraction patterns of thermally annealed zirconolite from the LPC and their Rietveld analyses. (a) Zirconolite annealed at 800 °C. Rietveld refinement is based on the structural model of a cubic ZrO2 (labeled cub; Wyckoff 1963). (b) Zirconolite annealed at 900 °C. Rietveld refinement is based on structural models of stefanweissite (labeled 3O; Chukanov et al. 2019) and zirconolite-3T (labeled 3T; Zubkova et al. 2018). Weight fractions of 0.612(4) and 0.388(5) are obtained for the two phases. (Color online.)

X-ray powder diffraction patterns of thermally annealed zirconolite from th... Available to Purchase

Published: 01 August 2021
. Rietveld refinement is based on structural models of stefanweissite (labeled 3O; Chukanov et al. 2019 ) and zirconolite-3 T (labeled 3 T ; Zubkova et al. 2018 ). Weight fractions of 0.612(4) and 0.388(5) are obtained for the two phases. (Color online.)
Journal Article

New minerals and nomenclature modifications approved in 2018 Available to Purchase

U. Hålenius, F. Hatert, M. Pasero, S. J. Mills
Published: 07 August 2018
Mineralogical Magazine (2018) 82 (4): 1015–1021.
DOI: https://doi.org/10.1180/mgm.2018.148
... Stefanweissite (Ca, REE ) 2 Zr 2 (Nb,Ti)(Ti,Nb) 2 Fe 2+ O 14 In den Dellen (Zieglowski) pumice quarry, 1.5 km NE of Mendig, Laach Lake (Laacher See) volcano, Eifel region, Rhineland-Palatinate, Germany Nikita V. Chukanov*, Natalia V. Zubkova, Igor V. Pekov, Marina F. Vigasina, Yury S. Polekhovsky...
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