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metavariscite

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Journal Article
Published: 08 July 2020
Mineralogical Magazine (2020) 84 (4): 568–583.
...Uwe Kolitsch; Matthias Weil; Vadim M. Kovrugin; Sergey V. Krivovichev Abstract We report the crystal structures of four synthetic members of the variscite group (space group type Pbca ) and of bonacinaite, the first naturally occurring scandium arsenate member of the metavariscite group. All...
FIGURES | View All (5)
Journal Article
Published: 01 October 2007
American Mineralogist (2007) 92 (10): 1695–1703.
...Kirsten Drüppel; Andreas Hösch; Gerhard Franz Abstract The system Al 2 O 3 -P 2 O 5 -H 2 O contains many phosphate minerals that occur in various geologic environments. The natural occurrence of variscite (AlPO 4 ·2H 2 O, orthorhombic), including its monoclinic polymorph metavariscite, is largely...
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Journal Article
Published: 01 August 1996
Mineralogical Magazine (1996) 60 (4): 671–672.
Journal Article
Published: 01 November 1940
American Mineralogist (1940) 25 (11): 719–725.
...Duncan McConnell Abstract In 1916, W. T. Schaller (1) suggested the existence of the isodimorphous series, variscite-metavariscite. Until recently no additional data were available to test the validity of this premise, so it seemed desirable to investigate the supposed members of the series by x...
Journal Article
Published: 01 February 1925
American Mineralogist (1925) 10 (2): 23–28.
Journal Article
Published: 01 November 2016
The Canadian Mineralogist (2016) 54 (6): 1513–1523.
.... It is associated with crandallite, fluorwavellite, montgomeryite, and variscite/metavariscite. The mineral occurs as colorless tapering blades, elongated parallel to [100], flattened on {001} and exhibiting the forms {100}, {010}, {001}, , and . The streak is white, the luster is vitreous, and crystals...
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Journal Article
Published: 01 May 2005
American Mineralogist (2005) 90 (5-6): 984–990.
...Georges Calas; Laurence Galoisy; Amonmat Kiratisin Abstract The color of variscite from three different localities (Pannecé, France; Sarrabus, Sardinia; Ervedosa, Portugal) and metavariscite from Utah was investigated by diffuse reflectance and EPR spectroscopy. These samples contain low levels...
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Overview on <b>metavariscite</b>-type minerals and synthetic compounds (seven phos...
Published: 08 July 2020
Table 2. Overview on metavariscite-type minerals and synthetic compounds (seven phosphates and one arsenate). Mineral/Compound Space group a (Å) b (Å) c (Å) β (°) V (Å 3 ) Ref. Metavariscite, AlPO 4 ⋅2H 2 O P 2 1 / n 5.178(2) 9.514(2) 8.454(2) 90.35(2
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Idealised topologies of frameworks in <b>metavariscite</b> ( a ,  b ) and variscit...
Published: 08 July 2020
Fig. 5. Idealised topologies of frameworks in metavariscite ( a , b ) and variscite ( c , d ). The black and white vertices in the simple hexagonal nets in ( a , c ) correspond to the up and down linkages, respectively. The grey squares in ( b , d ) highlight the location of the four-membered
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Information-based complexity parameters for variscite and <b>metavariscite</b> ( v...
Published: 08 July 2020
Table 10. Information-based complexity parameters for variscite and metavariscite ( v in atoms per cell, I G in bit per atom and I G,total in bits per cell). Mineral Framework topological complexity Total structural complexity Sp. gr. v I G I G,total Sp
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List of selected phases of the variscite and <b>metavariscite</b> groups as potent...
Published: 08 July 2020
Table 11. List of selected phases of the variscite and metavariscite groups as potential electrode materials for Li ion batteries. Space group Initial material (mineral name) Final material Redox couple Theoretical capacity Experimental capacity Average potential (mAh/g
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The crystal structures of <b>metavariscite</b>, variscite and kosnarite: (a) metav...
Published: 01 January 2002
Figure 35. The crystal structures of metavariscite, variscite and kosnarite: (a) metavariscite projected onto (001); (b) metavariscite projected onto (100); (c) variscite projected onto (001); (d) variscite projected onto (100); (Alϕ 6 ) octahedra are 4 4 -net-shaded; (e) kosnarite projected
Journal Article
Published: 01 December 2017
Mineralogical Magazine (2017) 81 (6): 1405–1429.
... shown the presence of: (1) four minerals of the turquoise group: turquoise, faustite, chalcosiderite and planerite; (2) other phosphates from different groups: wavellite, crandallite, goyazite, gorceixite, variscite, metavariscite, fluorapatite; and (3) other minerals: voltaite, adularia and quartz...
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Journal Article
Published: 01 October 1990
American Mineralogist (1990) 75 (9-10): 1170–1175.
... by a network of H bonds. Graphically identical [M(T ϕ 4 ) ϕ 3 ] sheets occur in the structure of newberyite and as components of the heteropolyhedral frameworks of the structures of metavariscite and variscite. Copyright © 1990 by the Mineralogical Society of America 1990 ...
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Dependence of the measure of similarity on the crystal volume for the varis...
Published: 08 July 2020
Fig. 4. Dependence of the measure of similarity on the crystal volume for the variscite group ( a ) and the metavariscite group ( b ).
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Diffuse reflectance spectra of massive variscite samples in the visible ran...
Published: 01 May 2005
F igure 2. Diffuse reflectance spectra of massive variscite samples in the visible range. ( a ) Ervedosa; ( b ) Pannecé; ( c ) Sardinia; ( d ) metavariscite from Utah. The inset shows a detail of the spectrum of variscite and metavariscite. The dips correspond to the 4 A 2 g ( F ) → 2 E
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Selected frameworks from phosphate structures; ( a ) variscite; ( b ) metav...
Published: 01 August 2014
F ig . 27. Selected frameworks from phosphate structures; ( a ) variscite; ( b ) metavariscite; ( c ) fluellite; ( d ) libethenite; ( e ) palermoite; ( f ) burangite; ( g ) wicksite; ( h ) seamanite. Legend as in Fig. 24 .
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EPR spectrum of V 4+  in variscites from ( a ) Pannecé, ( b ) Ervedosa, ( ...
Published: 01 May 2005
F igure 3. EPR spectrum of V 4+ in variscites from ( a ) Pannecé, ( b ) Ervedosa, ( c ) Sardinia, and ( d ) metavariscite from Utah. The position of the parallel and perpendicular hyperfine components is indicated at the top.
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Polyhedral representation of the framework crystal structure of metavarisci...
Published: 08 July 2020
Fig. 3. Polyhedral representation of the framework crystal structure of metavariscite-type bonacinaite, (Sc,Al)(As,P)O 4 ⋅2H 2 O, in a view along [100]. Hydrogen bonds are shown with dashed lines. The unit cell is outlined. Note the channels parallel to [100], which are relatively large
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Representative XRD patterns of basally oriented Mg-saturated clays from eac...
Published: 01 December 2006
Figure 3. Representative XRD patterns of basally oriented Mg-saturated clays from each soil group. (I-S – interstratified illite-smectite; Ch – chlorite; Ka – kaolinite; Ja – jarosite; S-HIS – interstratified smectite-hydroxy-Al smectite; Le – leucophosphite; Mi – minyulite; Me – metavariscite