Arsenate arsenite

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Yellow spherules of halilsarpite, an arsenate arsenite mineral, on orange-brown smolyaninovite

An arsenate arsenite is a chemical compound or salt that contains arsenate and arsenite anions (AsO33- and AsO43-). These are mixed anion compounds or mixed valence compounds. Some have third anions. Most known substances are minerals, but a few artificial arsenate arsenite compounds have been made. Many of the minerals are in the Hematolite Group.

An arsenate arsenite compound may also be called an arsenite arsenate.

Properties[edit]

Some members of this group of materials like mcgovernite has an extremely high unit cell dimension of 204 Å.[1]

Related[edit]

Mixed valence pnictide compounds related to the arsenate arsenites include the nitrite nitrates, and phosphate phosphites.

List[edit]

name formula ratio

AsO4:AsO3

system space group unit cell Å volume density properties references
Arsenic dioxide AsO2 1:1 orthorhomnic Pnma a=8.597 b=5.235 c=7.269 Z=8 327.1 4.382 [2]
Arsenic(III) Arsenic(V) Oxide Hydroxide As3O5(OH) 1:2 monoclinic P21/c a = 12.504 b = 4.593 c = 10.976 β = 118.08° Z = 4 556.2 3.84 [3]
H6As3+7As5+7O31 1:1 hexagonal P63 a = 12.0525 c = 4.7344 Z = 2 595.6 [4]
Segerstromite Ca3(As5+O4)2[As3+(OH)3]2 2:1 cubic I213 a = 10.7627 Z = 4 1246.71 3.46 colourless; refract index: n = 1.731 [5]
Synadelphite Mn2+9(As5+O4)2(As3+O3)(OH)9 · 2H2O 2:1 Orthorhombic Pnma a = 10.75 b = 18.86c = 9.88 Z=4 2005 3.58 red; Biaxial (+); refract index: nα = 1.750 - 1.870 nβ = 1.751 - 1.880 nγ = 1.761 - 1.930 [6]
Hematolite (Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23 2:1 trigonal R3 a = 8.275 Å, c = 36.60 Å Z=3 2,170.4 3.49 deep red; Uniaxial (-) refractive index nω = 1.733 nε = 1.714; Birefringence: 0.019 [7][8]
Turtmannite (Mn,Mg)22.5Mg3-3x((V5+,As5+)O4)3(As3+O3)x(SiO4)3O5-5x(OH)20+x trigonal a = 8.259 c = 204.3 Z=12 12,068 3.8 light yellow; Uniaxial (-); refractive index: nε = 1.787 [9]
Carlfrancisite Mn2+3(Mn2+,Mg,Fe3+,Al)42[As3+O3]2(As5+O4)4[(Si,As5+)O4]6[(As5+,Si)O4]2(OH)42 trigonal R3c a = 8.2238 c = 205.113 Z=6 12,013.5 3.620 yellow-orange; Uniaxial (+) refractive index: nω = 1.756(2) nε = 1.758 Birefringence: δ = 0.002 [10]
K2Cu3(As2O6)2 1:1 monoclinic C2m a=10.359 b=5.388 c=11.234 β=110.48° [As(V)As(III)O6]4− [11]
Dixenite CuMn2+14Fe2+(SiO4)2(As5+O4)(As3+O3)5(OH)6 1:5 trigonal R3 a = 8.233 c = 37.499 Z=3 2201 4.35 deep red-brown; Uniaxial (+) refractive index nω = 1.970 nε = 1.730 [12]
Arakiite (Zn,Mn2+)(Mn2+,Mg)12(Fe3+,Al)2(As5+O4)2(As3+O3)(OH)23 2:1 monoclinic Cc a = 14.248 b = 8.228 c = 24.23 β = 93.62° Z=4 2843 3.41 orange-red brown; Biaxial (-); refract index: nα = 1.723 nβ = 1.744 nγ = 1.750

Birefringence: 0.027

[13]
Kraisslite Zn3(Mn,Mg)25(Fe3+,Al)(As3+O3)2[(Si,As5+)O4]10(OH)16 5:1 Orthorhombic C2221 a = 8.1821 b = 14.1946 c = 43.9103 Z=4 5099.8 3.876 pale red; Uniaxial (+) Refractive index: nε = 1.805 [14]
Mcgovernite Mn19Zn3(AsO4)3(AsO3)(SiO4)3(OH)21 3:1 trigonal R3m or R3m a = 8.22 c = 203.1 Z=6 11,887.52 3.719 brown; Uniaxial (+) Refractive index: nω = 1.757 nε = 1.760

Birefringence: δ = 0.003

[15]
Halilsarpite [Mg(H2O)6][CaAs3+2(Fe3+2.67Mo6+0.33)(AsO4)2O7] orthorhomnic Imma a = 26.489 b = 7.4205 c = 10.4378 2051.7 lemon yellow; Biaxial (-) refractive index: nα = 1.646 nβ = 1.765(5) nγ = 1.815(5) 2V: 62° Max Birefringence: δ = 0.169 [16]
Wiklundite Pb2(Mn2+,Zn)3(Fe3+,Mn2+)2(Mn2+,Mg)19(As3+O3)2[(Si,As5+)O4]6(OH)18Cl6 hexagonal ? R3c a = 8.257 c = 126.59 Z = 6 7474 4.072 dark reddish brown [17]
Bi8O6(AsO3)2(AsO4)2 monoclinic I2/a a=24.372 b=5.528 c=29.90 β=99.058 Z=8 3978 7.652 colourless [18]
Th(AsIII4AsV4O18) 1:1 monoclinic C2/c a=18.2148 b 5.19792 c=17.3588 β=99.1298 Z=4 1622.70 4.582 colourless [19]

References[edit]

  1. ^ Moore, P. B.; Araki, T (1 February 1978). "Hematolite; a complex dense-packed sheet structure" (PDF). American Mineralogist. 63 (1–2): 150–159.
  2. ^ Jones, P. G.; Beesk, W.; Sheldrick, G. M.; Sharman, E. (1980-02-01). "Arsenic dioxide". Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 36 (2): 439–440. doi:10.1107/S0567740880003433. ISSN 0567-7408.
  3. ^ Bodenstein, Doris; Brehm, Axel; Jones, Peter G.; Schwarzmann, Einhard; Sheldrick, George M. (1982-02-01). "Darstellung und Kristallstruktur vom Arsen(III)arsen(V)oxidhydroxid As 3 O 5 (0H) / Preparation and Crystal Structure of the Arsenic(III) Arsenic(V) Oxide Hydroxide As 3 O 5 (OH)". Zeitschrift für Naturforschung B. 37 (2): 138–140. doi:10.1515/znb-1982-0204. ISSN 1865-7117. S2CID 96596612.
  4. ^ Orosel, Denis; Dinnebier, Robert E.; Balog, Paul; Jansen, Martin (July 2007). "The crystal structure of a new mixed valence arsenic(III,V)oxoacid H 6 As 3+ 7 As 5+ 7 O 31". Zeitschrift für Kristallographie. 222 (7): 321–325. Bibcode:2007ZK....222..321O. doi:10.1524/zkri.2007.222.7.321. ISSN 0044-2968. S2CID 95624012.
  5. ^ Yang, Hexiong; Downs, Robert T.; Jenkins, Robert A.; Evans, Stanley H. (2018-09-01). "Segerstromite, Ca3(As5+O4)2[As3+(OH)3]2, the first mineral containing As3+(OH)3, the arsenite molecule, from the Cobriza mine in the Atacama Region, Chile". American Mineralogist. 103 (9): 1497–1501. Bibcode:2018AmMin.103.1497Y. doi:10.2138/am-2018-6329. ISSN 0003-004X. S2CID 106199868.
  6. ^ "Synadelphite". Mindat.
  7. ^ "Hematolite". Mindat.
  8. ^ Dunn, Pete J.; Peacor, Donald R. (September 1983). "A ferric iron equivalent of hematolite from Sterling Hill, New Jersey and Långban, Sweden". Mineralogical Magazine. 47 (344): 381–385. Bibcode:1983MinM...47..381D. doi:10.1180/minmag.1983.047.344.15. ISSN 0026-461X. S2CID 129662981.
  9. ^ "Turtmannite". Mindat.
  10. ^ "Carlfrancisite". Mindat.
  11. ^ Effenberger, H.; Pertlik, F. (October 1987). "[As(V)As(III)O6]4−: An uncommon anion group in the crystal structure of K2Cu3(As2O6)2". Journal of Solid State Chemistry. 70 (2): 219–224. Bibcode:1987JSSCh..70..219E. doi:10.1016/0022-4596(87)90059-4.
  12. ^ "Dixenite". Mindat.
  13. ^ "Arakiite". Mindat.
  14. ^ "Kraisslite". Mindat.
  15. ^ "Mcgovernite". Mindat.
  16. ^ Husdal, Tomas; Grey, Ian E.; Friis, Henrik; Dal Bo, Fabrice; Kampf, Anthony R.; MacRae, Colin M.; Mumme, W. Gus; Ljøstad, Ole-Thorstein; Shanks, Finlay (2020-01-23). "Halilsarpite, a new arsenate analogue of walentaite, from the Oumlil mine, Bou Azzer district, Morocco". European Journal of Mineralogy. 32 (1): 89–98. Bibcode:2020EJMin..32...89H. doi:10.5194/ejm-32-89-2020. hdl:10852/76149. ISSN 1617-4011. S2CID 211082062.
  17. ^ Cooper, Mark A.; Hawthorne, Frank C.; Langhof, Jörgen; Hålenius, Ulf; Holtstam, Dan (August 2017). "Wiklundite, ideally Pb 2 [4] (Mn 2+ ,Zn) 3 (Fe 3+ ,Mn 2+ ) 2 (Mn 2+ ,Mg) 19 (As 3+ O 3 ) 2 [(Si,As 5+ )O 4 ] 6 (OH) 18 Cl 6 , a new mineral from Långban, Filipstad, Värmland, Sweden: Description and crystal structure". Mineralogical Magazine. 81 (4): 841–855. Bibcode:2017MinM...81..841C. doi:10.1180/minmag.2016.080.136. ISSN 0026-461X. S2CID 103754064.
  18. ^ Liu, Jun-Hui; Kong, Fang; Gai, Yan-Li; Mao, Jiang-Gao (January 2013). "Syntheses, crystal structures and characterizations of two new bismuth(III) arsenites". Journal of Solid State Chemistry. 197: 228–235. doi:10.1016/j.jssc.2012.08.019.
  19. ^ Yu, Na; Klepov, Vladislav V.; Kegler, Philip; Bosbach, Dirk; Albrecht-Schmitt, Thomas E.; Alekseev, Evgeny V. (2014-08-18). "Th(As III 4 As V 4 O 18 ): a Mixed-Valent Oxoarsenic(III)/arsenic(V) Actinide Compound Obtained under Extreme Conditions". Inorganic Chemistry. 53 (16): 8194–8196. doi:10.1021/ic5013704. ISSN 0020-1669. PMID 25075555.
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