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carlfrancisite

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Journal Article

Long-range and short-range cation order in the crystal structures of carlfrancisite and mcgovernite

Frank C. Hawthorne
Published: 01 October 2018
Mineralogical Magazine (2018) 82 (5): 1101–1118.
DOI: https://doi.org/10.1180/minmag.2017.081.098
...Frank C. Hawthorne ABSTRACT The crystal structures of carlfrancisite, ideally Mn 3 2+ (Mn 2+ ,Mg,Fe 3+ ,Al) 42 (As 3+ O 3 ) 2 (As 5+ O 4 ) 4 [(Si,As 5+ )O 4 ] 8 (OH) 42 , hexagonal (rhombohedral), R 3̄ m with Z = 6, and unit-cell parameters: a = 8.2238(2), c = 205.113(6) Å and V = 12013.5(4) Å 3...
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View PDF for article title, Long-range and short-range cation order in the crystal structures of <span class="search-highlight">carlfrancisite</span> and mcgovernite
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Journal Article

Carlfrancisite: Mn 3 2+ (Mn 2+ ,Mg,Fe 3+ ,Al) 42 (As 3+ O 3 ) 2 (As 5+ O 4 ) 4 [(Si,As 5+ )O 4 ] 6 [(As 5+ ,Si)O 4 ] 2 (OH) 42 , a new arseno-silicate mineral from the Kombat mine, Otavi Valley, Namibia

Frank C. Hawthorne, Yassir A. Abdu, Neil A. Ball, William W. Pinch
Published: 01 October 2013
American Mineralogist (2013) 98 (10): 1693–1696.
DOI: https://doi.org/10.2138/am.2013.4426
...Frank C. Hawthorne; Yassir A. Abdu; Neil A. Ball; William W. Pinch Abstract Carlfrancisite, Mn 3 2+ (Mn 2+ ,Mg,Fe 3+ ,Al) 42 (As 3+ O 3 ) 2 (As 5+ O 4 ) 4 [(Si,As 5+ )O 4 ] 6 [(As 5+ ,Si)O 4 ] 2 (OH) 42 , is a new mineral from the Kombat mine, Otavi Valley, Namibia, and occurs as curved platy...
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View PDF for article title, <span class="search-highlight">Carlfrancisite</span>: Mn 3 2+ (Mn 2+ ,Mg,Fe 3+ ,Al) 42 (As 3+ O 3 ) 2 (As 5+ O 4 ) 4 [(Si,As 5+ )O 4 ] 6 [(As 5+ ,Si)O 4 ] 2 (OH) 42 , a new arseno-silicate mineral from the Kombat mine, Otavi Valley, Namibia
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Principal compositional differences between mcgovernite, carlfrancisite and...

Published: 01 October 2018
Table 9. Principal compositional differences between mcgovernite, carlfrancisite and turtmannite. Site Z (1) M (4) T (4) As (1) As (3) Layer 7 5 7 1 Mcgovernite Zn Mn 2+ > Mg Si > As 5+ As 5+ As 3+ > □ Carlfrancisite Mn 2+ Mg > Mn 2+ Si
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The chemical composition (wt.%) and unit formulae (apfu) of mcgovernite and...

Published: 01 October 2018
Table 1. The chemical composition (wt.%) and unit formulae (apfu) of mcgovernite and carlfrancisite. Oxide Carlfrancisite Mcgovernite Ion Carlfrancisite Mcgovernite As 2 O 5 16.76(28) 17.37 As 2 O 5 * 12.89 13.06 As 5+ 5.02 5.22 As 2 O 3 * 3.33 3.71 As 3
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The Raman spectrum of carlfrancisite.

The Raman spectrum of carlfrancisite.

Published: 01 October 2013
Figure 2 The Raman spectrum of carlfrancisite.
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The Raman spectrum of carlfrancisite; after Hawthorne et al. (2013).

The Raman spectrum of carlfrancisite; after Hawthorne et al . ( 2013 ).

Published: 01 October 2018
Fig. 4. The Raman spectrum of carlfrancisite; after Hawthorne et al . ( 2013 ).
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The infrared spectrum of carlfrancisite from 1200 to 650 cm−1.

The infrared spectrum of carlfrancisite from 1200 to 650 cm −1 .

Published: 01 October 2013
Figure 4 The infrared spectrum of carlfrancisite from 1200 to 650 cm −1 .
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The Raman (top) and infrared (bottom) spectra of carlfrancisite in the principal OH-stretching region.

The Raman ( top ) and infrared ( bottom ) spectra of carlfrancisite in the ...

Published: 01 October 2013
Figure 3 The Raman ( top ) and infrared ( bottom ) spectra of carlfrancisite in the principal OH-stretching region.
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Variation in &lt;T,[4]As–O&gt; as a function of the site population of As5+ in mcgovernite (green) and carlfrancisite (red).

Variation in < T , [4] As –O> as a function of the site population o...

Published: 01 October 2018
Fig. 1. Variation in < T , [4] As –O> as a function of the site population of As 5+ in mcgovernite (green) and carlfrancisite (red).
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Miscellaneous information for mcgovernite and carlfrancisite. Mcgo...

Published: 01 October 2018
Table 2. Miscellaneous information for mcgovernite and carlfrancisite. Mcgovernite Carlfrancisite Unit-cell dimensions a (Å) 8.2061(3) 8.2238(2) c 204.118(8) 205.113(6) V (Å 3 ) 11,903.8(12) 12,013.4(11) Space group R 3̄ m R 3̄ m Z 6 6
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Part of the crystal structures of mcgovernite, carlfrancisite and turtmannite projected along [100], showing the first eight distinct layers of cation-centred polyhedra labelled m = 0–7; note that the stacking sequence reverses at layer 7 (via a centre of symmetry) and the resulting 14-layer stacking comprises ⅙ of the c-axis repeat. The following cations and cation-centred coordination polyhedra correspond to the following colours in this and the following figures: Mn2+: yellow, red at Z(2) in carlfrancisite; As5+: orange; Si4+: purple; As3+: dull green; Zn2+: pale blue at Z(1), bright green at Z(2) in mcgovernite; Mg2+: pale mauve; and V5+: black. Layers are designated by the letter m where m = 0–7.

Part of the crystal structures of mcgovernite, carlfrancisite and turtmanni...

Published: 01 October 2018
Fig. 5. Part of the crystal structures of mcgovernite, carlfrancisite and turtmannite projected along [100], showing the first eight distinct layers of cation-centred polyhedra labelled m  = 0–7; note that the stacking sequence reverses at layer 7 ( via a centre of symmetry) and the resulting
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Images of carl-francisite: (a) platy aggregates on a matrix of Mn arsenates and oxides; (b) yellow-orange platy aggregate of carlfrancisite.

Images of carl-francisite: ( a ) platy aggregates on a matrix of Mn arsenat...

Published: 01 October 2013
Figure 1 Images of carl-francisite: ( a ) platy aggregates on a matrix of Mn arsenates and oxides; ( b ) yellow-orange platy aggregate of carlfrancisite.
Journal Article

Garpenbergite, Mn 6 □As 5+ Sb 5+ O 10 (OH) 2 , a new mineral related to manganostibite, from the Garpenberg Zn–Pb–Ag deposit, Sweden

Dan Holtstam, Luca Bindi, Hans-Jürgen Förster, Andreas Karlsson, Kjell Gatedal
Published: 21 January 2022
Mineralogical Magazine (2022) 86 (1): 1–8.
DOI: https://doi.org/10.1180/mgm.2022.6
...Dan Holtstam; Luca Bindi; Hans-Jürgen Förster; Andreas Karlsson; Kjell Gatedal Abstract Garpenbergite is a new mineral (IMA2020-099) from the Garpenberg Norra mine, Hedemora, Dalarna, Sweden. It occurs with carlfrancisite and minor stibarsen, paradocrasite and filipstadite in a fractured skarn...
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The short-range environment around O(4) in carlfrancisite and mcgovernite. ...

Published: 01 October 2018
Table 8. The short-range environment around O(4) in carlfrancisite and mcgovernite. Distance Bond valence (vu) (Å) Z (2) vacant Z (2) occupied Carlfrancisite O(4)– As (3) 1.817 0.91 □ O(4)– Z (2) 1.879 □ 0.67 □ O(4)– Z (2)′ 2.083 □ □ 0.44 O(4)– M (2
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Site-scattering values and assigned site-populations in carlfrancisite and ...

Published: 01 October 2018
Table 5. Site-scattering values and assigned site-populations in carlfrancisite and mcgovernite. Refined site-scattering (epfu) Coordination number, mean bond length (Å) Assigned site-populations (apfu) Carlfrancisite Mcgovernite Carlfrancisite Mcgovernite Carlfrancisite
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Back-scattered electron scanning electron microscopy image of a polished section of the garpenbergite (Grp) type specimen, with carlfrancisite (Cfc), jacobsite (Jcb), alleghanyite (Alh), dolomite (Dol) and kutnohorite (Kut). The arrow points to one area (white) containing a fine intergrowth of stibarsen and paradocrasite. Sample GEO-NRM #20200040.

Back-scattered electron scanning electron microscopy image of a polished se...

Published: 21 January 2022
Fig. 1. Back-scattered electron scanning electron microscopy image of a polished section of the garpenbergite (Grp) type specimen, with carlfrancisite (Cfc), jacobsite (Jcb), alleghanyite (Alh), dolomite (Dol) and kutnohorite (Kut). The arrow points to one area (white) containing a fine
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Atom coordinates and displacement parameters for carlfrancisite and mcgover...

Published: 01 October 2018
Table 3. Atom coordinates and displacement parameters for carlfrancisite and mcgovernite. Site x y z U 11 U 22 U 33 U 23 U 13 U 12 U eq Carlfrancisite As (1) ⅓ ⅔ 0.01445(2) 0.01227(16) 0.01227(16) 0.0201(3) 0 0 0.00614(8) 0.01488
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Selected interatomic distances (Å) in carlfrancisite and mcgovernite. ...

Published: 01 October 2018
Table 4. Selected interatomic distances (Å) in carlfrancisite and mcgovernite. Carlfrancisite Mcgovernite Carlfrancisite Mcgovernite T (1)–O(5),b,c 1.640(2) 1.647(4) T (2)–O(17),b,c 1.677(2) 1.667(4) T (1)–O(13) 1.635(4) 1.659(7) T (2)–O(10) 1.572(5
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Bond-valence table for carlfrancisite. As (1) As (2) As (3) ...

Published: 01 October 2018
Table 7. Bond-valence table for carlfrancisite. As (1) As (2) As (3) Z (1) Z (2) M (1) M (2) M (3) M (4) M (5) M (6) M (7) M (8) M (9) T (1) T (2) T (3) T (4) Σ O(1) 1.15 0.26 ×3 1.93 O(2) 0.41 0.30, 0.98
Journal Article

The suppression of lone-pair stereoactivity in [Cu + (As 3+ O 3 ) 4 ] clusters in dixenite: A tribute to Paul B. Moore

Frank C. Hawthorne, John M. Hughes
Published: 01 October 2021
American Mineralogist (2021) 106 (10): 1580–1585.
DOI: https://doi.org/10.2138/am-2021-7719
... embedded within their close-packed structures. Examples are the [Cu + (As 3+ O 3 ) 4 ] cluster and the [ Mn 3 2 + O 12 ] cluster reported here in dixenite and the local replacement of an As 3+ O 3 group by a [Mg, Mn 3 2 + O 13 ] cluster in mcgovernite and carlfrancisite...
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View PDF for article title, The suppression of lone-pair stereoactivity in [Cu + (As 3+ O 3 ) 4 ] clusters in dixenite: A tribute to Paul B. Moore
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