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andyrobertsite

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Journal Article

Calcio-andyrobertsite-2O, KCaCu 5 (AsO 4 ) 4 [AsO 2 (OH) 2 ] · 2H 2 O : its description, crystal structure and relation with calcio-andyrobertsite-1M

Halil SARP, Radovan ČKERNÝ
Published: 01 January 2004
European Journal of Mineralogy (2004) 16 (1): 163–169.
DOI: https://doi.org/10.1127/0935-1221/2004/0016-0163
...Halil SARP; Radovan ČKERNÝ Abstract Calcio-andyrobertsite-2 O , ideally, CaCu 5 AsO 4 [AsO 4 (AsO 2 ] · 2H 2 O, is a polytype of calcio-andyrobertsite-1 M , and occurs in a specimen of quartz gangue found at the Tsumeb mine, Namibia, together with cuprian adamite. It forms platy crystals...
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HIGHLY UNDERSATURATED ANIONS IN THE CRYSTAL STRUCTURE OF ANDYROBERTSITE – CALCIO-ANDYROBERTSITE, A DOUBLY ACID ARSENATE OF THE FORM K (Cd,Ca) [Cu 2+ 5 (AsO 4 ) 4 {As(OH) 2 O 2 }] (H 2 O) 2

Mark A. Cooper, Frank C. Hawthorne
Published: 01 August 2000
The Canadian Mineralogist (2000) 38 (4): 817–830.
DOI: https://doi.org/10.2113/gscanmin.38.4.817
...Mark A. Cooper; Frank C. Hawthorne Abstract The crystal structure of andyrobertsite, ideally K Cd [Cu 2+ 5 (AsO 4 ) 4 {As(OH) 2 O 2 }] (H 2 O) 2 , monoclinic, a 9.8102(9), b 10.0424(6), c 9.9788(7) Å, β 101.686(7)°, V 962.6(1) Å 3 , P 2 1 / m , Z = 2, has been solved by direct methods and refined...
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Variation in chemical composition of the crystal of <span class="search-highlight">andyrobertsite</span> used for...

Variation in chemical composition of the crystal of andyrobertsite used for...

Published: 01 August 2000
F ig . 1. Variation in chemical composition of the crystal of andyrobertsite used for crystal-structure work (marked by thick black line); the bulk composition (+) lies exactly on the boundary between andyrobertsite and calcio-andyrobertsite.
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CHEMICAL COMPOSITIONS (wt.%) AND UNIT FORMULAE ( apfu ) OF <span class="search-highlight">ANDYROBERTSITE</span> A...

CHEMICAL COMPOSITIONS (wt.%) AND UNIT FORMULAE ( apfu ) OF ANDYROBERTSITE A...

Published: 01 August 2000
TABLE 2. CHEMICAL COMPOSITIONS (wt.%) AND UNIT FORMULAE ( apfu ) OF ANDYROBERTSITE AND CALCIO-ANDYROBERTSITE FROM FIGURE 1 .
Journal Article

The crystal structures of lavendulan, sampleite, and a new polymorph of sampleite

Gerald Giester, Uwe Kolitsch, Peter Leverett, Peter Turner, Peter A. Williams
Published: 01 January 2007
European Journal of Mineralogy (2007) 19 (1): 75–93.
DOI: https://doi.org/10.1127/0935-1221/2007/0019-0075
... slightly reduced water content of the polymorph is neglected. Some physicochemical properties of the sampleite polymorph are given. Sheets identical to those in lavendulan are encountered in zdenekite, the Pb-analogue of lavendulan. Very similar sheets are found in andyrobertsite, calcio-andyrobertsite(−1...
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Projection of the structures of calcio-<span class="search-highlight">andyrobertsite</span>-2 O (a) and of andy...

Projection of the structures of calcio-andyrobertsite-2 O (a) and of andy...

Published: 01 January 2004
Fig. 2. Projection of the structures of calcio-andyrobertsite-2 O (a) and of andyrobertsite-1 M ( Cooper and Hawthorne, 2000 ) (b) approx. along the b -axes. AsO 4 tetrahedrons in dark grey, CuO 5 square pyramids in light grey. Positions of potassium (K) and calcium (Ca) cations
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The heteropolyhedral (CuO 5 )-(Asϕ 4 ) slab, a structural unit in both poly...

The heteropolyhedral (CuO 5 )-(Asϕ 4 ) slab, a structural unit in both poly...

Published: 01 January 2004
Fig. 1. The heteropolyhedral (CuO 5 )-(Asϕ 4 ) slab, a structural unit in both polytypes, together with positions of potassium (K) and calcium (Ca) or mixed (M) cations and that of the oxygen of the water molecule (W) as projected in calcio-andyrobertsite-2 O (a) and andyrobertsite-1 M
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MISCELLANEOUS INFORMATION FOR <span class="search-highlight">ANDYROBERTSITE</span>

MISCELLANEOUS INFORMATION FOR ANDYROBERTSITE

Published: 01 August 2000
TABLE 1. MISCELLANEOUS INFORMATION FOR ANDYROBERTSITE
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DETAILS OF H-BONDING IN <span class="search-highlight">ANDYROBERTSITE</span>

DETAILS OF H-BONDING IN ANDYROBERTSITE

Published: 01 August 2000
TABLE 5. DETAILS OF H-BONDING IN ANDYROBERTSITE
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BOND–VALENCE* ( vu ) TABLE FOR <span class="search-highlight">ANDYROBERTSITE</span>

BOND–VALENCE* ( vu ) TABLE FOR ANDYROBERTSITE

Published: 01 August 2000
TABLE 6. BOND–VALENCE* ( vu ) TABLE FOR ANDYROBERTSITE
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ATOMIC POSITIONS AND DISPLACEMENT FACTORS* FOR <span class="search-highlight">ANDYROBERTSITE</span>

ATOMIC POSITIONS AND DISPLACEMENT FACTORS* FOR ANDYROBERTSITE

Published: 01 August 2000
TABLE 3. ATOMIC POSITIONS AND DISPLACEMENT FACTORS* FOR ANDYROBERTSITE
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SELECTED INTERATOMIC DISTANCES (Å) AND ANGLES (°) FOR <span class="search-highlight">ANDYROBERTSITE</span>

SELECTED INTERATOMIC DISTANCES (Å) AND ANGLES (°) FOR ANDYROBERTSITE

Published: 01 August 2000
TABLE 4. SELECTED INTERATOMIC DISTANCES (Å) AND ANGLES (°) FOR ANDYROBERTSITE
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Chemical analysis (wt.%) of calcio-<span class="search-highlight">andyrobertsite</span>-2 O .

Chemical analysis (wt.%) of calcio-andyrobertsite-2 O .

Published: 01 January 2004
Table 1. Chemical analysis (wt.%) of calcio-andyrobertsite-2 O .
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Atom positional and displacement parameters for calcio-<span class="search-highlight">andyrobertsite</span>-2 O ....

Atom positional and displacement parameters for calcio-andyrobertsite-2 O ....

Published: 01 January 2004
Table 4. Atom positional and displacement parameters for calcio-andyrobertsite-2 O .
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Selected interatomic distances (Å) for calcio-<span class="search-highlight">andyrobertsite</span>-2 O .

Selected interatomic distances (Å) for calcio-andyrobertsite-2 O .

Published: 01 January 2004
Table 5. Selected interatomic distances (Å) for calcio-andyrobertsite-2 O .
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Bond valence ( vu ) table for calcio-<span class="search-highlight">andyrobertsite</span>-2 O .

Bond valence ( vu ) table for calcio-andyrobertsite-2 O .

Published: 01 January 2004
Table 6. Bond valence ( vu ) table for calcio-andyrobertsite-2 O .
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Comparative views perpendicular to the heteropolyhedral sheets of the cryst...

Comparative views perpendicular to the heteropolyhedral sheets of the cryst...

Published: 01 January 2007
Fig. 5. Comparative views perpendicular to the heteropolyhedral sheets of the crystal structures of (a) lavendulan [representative also of sampleite and the sampleite polymorph], (b) mahnertite, (c) andyrobertsite-1 M [representative also of calcio-andyrobertsite-1 M and -2 O ], and (d
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The structure of <span class="search-highlight">andyrobertsite</span> projected onto (100); legend as in Figures...

The structure of andyrobertsite projected onto (100); legend as in Figures...

Published: 01 August 2000
F ig . 6. The structure of andyrobertsite projected onto (100); legend as in Figures 2 and 3 .
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Experimental conditions of the single crystal X-ray crystallography and cry...

Experimental conditions of the single crystal X-ray crystallography and cry...

Published: 01 January 2004
Table 3. Experimental conditions of the single crystal X-ray crystallography and crystal parameters for calcio-andyrobertsite-2 O .
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The (CuO 5 )–(Asϕ 4 ) framework in <span class="search-highlight">andyrobertsite</span> projected down an axis 6°...

The (CuO 5 )–(Asϕ 4 ) framework in andyrobertsite projected down an axis 6°...

Published: 01 August 2000
F ig . 5. The (CuO 5 )–(Asϕ 4 ) framework in andyrobertsite projected down an axis 6° from [010]; legend as in Figure 3 .