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haiweeite

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Journal Article
Published: 01 April 2013
American Mineralogist (2013) 98 (4): 718–723.
...Jakub Plášil; Karla Fejfarová; Jiří Čejka; Michal Dušek; Radek Škoda; Jiří Sejkora Abstract The previously published crystal structure study suggested that haiweeite is orthorhombic, Cmcm , with a = 7.125(1), b = 17.937(2), c = 18.342(2) Å, and V = 2344.3(7) Å 3 , and an ideal chemical formula Ca...
FIGURES
Journal Article
Published: 01 August 2001
The Canadian Mineralogist (2001) 39 (4): 1153–1160.
...Peter C. Burns Abstract The structure of haiweeite, Ca[(UO 2 ) 2 Si 5 O 12 (OH) 2 ](H 2 O) 3 , Z = 4, orthorhombic, a 7.125(1), b 17.937(2), c 18.342(2) Å, V 2344.3(7) Å 3 , space group Cmcm , has been solved by direct methods and refined by full-matrix least-squares techniques to an agreement...
FIGURES | View All (4)
Journal Article
Published: 01 June 1969
American Mineralogist (1969) 54 (5-6): 966–969.
...William G. R. de Camargo; Darcy P. Svisero Abstract Haiweeite has been found at Perus, San Paulo, Brazil, along fractures of a tourmaline-bearing granite. The needle-like crystals of monoclinic symmetry have the optical constants: α = 1.533, β = 1.572, γ = 1.573; 2 V x = 18°; pleochroism pale...
Journal Article
Published: 01 August 1959
American Mineralogist (1959) 44 (7-8): 839–843.
...T. C. McBurney; Joseph Murdoch Abstract A hydrous calcium uranium silicate, found near the Haiwee Reservoir in the Coso Mountains, California, has been determined as a new mineral and named haiweeite, from the locality. It occurs as spherulitic aggregates, or single flake-like grains, on fracture...
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Uranyl silicate sheets in the crystal structure of <b>haiweeite</b>. Uranyl pentag...
Published: 01 April 2013
Figure 1 Uranyl silicate sheets in the crystal structure of haiweeite. Uranyl pentagonal bipyramids (blue) extending along [100] and chains of silicate tetrahedra are linked together by sharing of vertices and an edge between uranyl bipyramid and Si1 and Si2 tetrahedra. (Color online.)
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Crystal structure of <b>haiweeite</b> in the view along [010]. Adjacent sheets of ...
Published: 01 April 2013
Figure 2 Crystal structure of haiweeite in the view along [010]. Adjacent sheets of uranyl pentagonal bipyramids and silicate chains (labeled) are linked through the sharing of dimers of Ca-polyhedra (purple) in interlayer. Labeled are atoms belonging to OH groups (O6, O10) and split-sites
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EXAFS (left) and FT (right) spectra for ( a ) <b>haiweeite</b> and ( b ) soddyite....
Published: 01 July 2004
F igure 6. EXAFS (left) and FT (right) spectra for ( a ) haiweeite and ( b ) soddyite. Solid lines represent experimental data; dashed lines represent fits.
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MISCELLANEOUS INFORMATION CONCERNING <b>HAIWEEITE</b>
Published: 01 August 2001
TABLE 1. MISCELLANEOUS INFORMATION CONCERNING HAIWEEITE
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FINAL ATOMIC PARAMETERS FOR <b>HAIWEEITE</b>
Published: 01 August 2001
TABLE 2. FINAL ATOMIC PARAMETERS FOR HAIWEEITE
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SELECTED INTERATOMIC DISTANCES (Å) AND ANGLES (°) FOR <b>HAIWEEITE</b>
Published: 01 August 2001
TABLE 3. SELECTED INTERATOMIC DISTANCES (Å) AND ANGLES (°) FOR HAIWEEITE
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Polyhedral representation of the structure of <b>haiweeite</b> projected along [10...
Published: 01 August 2001
F ig . 1. Polyhedral representation of the structure of haiweeite projected along [100]. The Si tetrahedra are red, uranyl polyhedra are yellow, and Ca polyhedra are gray.
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Chains of silicate tetrahedra that occur in <b>haiweeite</b>. Si cations are shade...
Published: 01 August 2001
F ig . 3. Chains of silicate tetrahedra that occur in haiweeite. Si cations are shaded with parallel lines, O atoms are shaded in the lower-left or lower-right corners. See text for discussion.
Journal Article
Published: 01 June 2012
The Canadian Mineralogist (2012) 50 (3): 693–704.
... to coffinite, followed by minor fibrous coffinite forming in veins. Uranyl minerals, mostly uranophane with minor haiweeite precipitating in veins and in hand sample-scaled breccias, are present in significant amounts ( ca . 5% of the ore) not observed elsewhere in the Athabasca Basin. The multi-stage...
FIGURES | View All (6)
Journal Article
Published: 01 June 1981
American Mineralogist (1981) 66 (5-6): 610–625.
... the composition [ ( UO 2 ) ( Si O 4 ) ] n − 2 n and are crosslinked by a bridging oxygen atom to form a uranyl silicate sheet. These sheets are crossbonded by the additional cations in the structure. The uranyl minerals with a uranium to silicon ratio of 1:3 include week-site and haiweeite. A partial structure...
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Polyhedral representation of the uranyl silicate sheet that occurs in haiwe...
Published: 01 August 2001
F ig . 2. Polyhedral representation of the uranyl silicate sheet that occurs in haiweeite. Legend as in Figure 1 .
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( a ,  b ,  c ) Tetrahedral representations of the   2 T 6  3 T 4   chain i...
Published: 26 February 2020
Fig. 87. ( a , b , c ) Tetrahedral representations of the 2 T 6 3 T 4 chain in haiweeite , ( d ) a ball-and-stick and ( e ) a graphical representation of the chain. The structure of haiweeite projected ( f ) onto (100) and ( g ) along the b -axis. Dashed black lines outline
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Comparison of vertex connectivities in chain, ribbon and sheet structures w...
Published: 26 February 2020
---- -- ---- Howieite C 2 V 4 3 V 2 2.83 ---- -- ---- Tobermorite R 2 V 4 3 V 2 2.80 Zeophyllite S 2 V 3 3 V 2 Inesite R 2 V 6 3 V 4 2.80 Britvinite S 2 V 3 3 V 2 Syn. K 5 Gd 5 [Si 10 O 28 ] R 2 V 6 3 V 4 2.80 Molybdophyllite S 2 V 3 3 V 2 Haiweeite
Journal Article
Published: 01 February 2001
The Canadian Mineralogist (2001) 39 (1): 187–195.
... of such deposits. Fourteen uranyl silicates have been described as minerals ( Mandarino 1999 ). Uranyl silicates are dominated by the uranophane group, which includes nine species with a U:Si ratio of 1:1. Haiweeite, Ca[(UO 2 ) 2 Si 5 O 12 (OH) 2 ](H 2 O) 3 , and weeksite have U:Si ratios of 2:5...
FIGURES | View All (4)
Journal Article
Published: 01 April 2012
American Mineralogist (2012) 97 (4): 750–754.
... with weeksite, an orthorhombic unit cell: a = 14.1676(9), b = 14.1935(9), c = 35.754(2) Å, and V = 7189.7(2) Å 3 . Obviously, based on our new structure data on weeksite, the crystal symmetry and unit-cell parameters of this mineral worths to be reevaluated. Haiweeite, ideally Ca(UO 2 ) 2 (Si 5 O 12...
FIGURES
Journal Article
Published: 01 May 2004
American Mineralogist (2004) 89 (5-6): 721–724.
... by the alteration of nuclear waste will incorporate radionuclides into their structures, thereby retarding their release. Uranyl silicates (e.g., uranophane, uranophane-beta, boltwoodite, haiweeite, weeksite) are likely to be abundant in a geological repository for nuclear waste, owing to the alteration of spent...
FIGURES