Cobaltaustinite, CaCo(AsO4)(OH)

Yang Hexiong, Gelu Costin, John Keogh, Ren Lu, Robert T Downs

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

This study presents the first structural report of a natural cobaltaustinite sample (calcium cobalt arsenate hydroxide) based on single-crystal X-ray diffraction data. Cobaltaustinite, with the ideal formula CaCo(AsO4)(OH), belongs to the adelite mineral group. The CoO 6 octahedra share edges to form chains extending parallel to the c axis, which are cross-linked by Ca2+ ions and by sharing vertices with isolated AsO4 tetrahedra. The Ca2+ ions are situated in square antiprisms formed by eight O atoms. The major structural difference between the five calcium arsenates in the adelite group is shown in the bonding environments around the octahedrally coordinated M2+ cations (M = Cu, Zn, Co, Ni and Mg), with the average M-O distance decreasing from Cu-O in conichalcite, CaCu(AsO4)(OH) to Zn-O in austinite, CaZn(AsO 4)(OH), Co-O in cobaltaustinite, Ni-O in nickelaustinite, CaNi(AsO4)(OH), and Mg-O in adelite, CaMg(AsO4)(OH). The donor-acceptor O-H⋯O distance [2.721 (7) Å] in cobaltaustinite is similar to those in austinite and nickelaustinite, but different from those in adelite and conichalcite.

Original languageEnglish (US)
JournalActa Crystallographica Section E: Structure Reports Online
Volume63
Issue number2
DOIs
StatePublished - Feb 2007

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arsenates
calcium
Calcium
Ions
Cobalt
X-Ray Diffraction
tetrahedrons
hydroxides
Minerals
Cations
ions
apexes
cobalt
Positive ions
minerals
Single crystals
cations
X ray diffraction
Atoms
single crystals

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Structural Biology

Cite this

Cobaltaustinite, CaCo(AsO4)(OH). / Hexiong, Yang; Costin, Gelu; Keogh, John; Lu, Ren; Downs, Robert T.

In: Acta Crystallographica Section E: Structure Reports Online, Vol. 63, No. 2, 02.2007.

Research output: Contribution to journalArticle

Hexiong, Yang ; Costin, Gelu ; Keogh, John ; Lu, Ren ; Downs, Robert T. / Cobaltaustinite, CaCo(AsO4)(OH). In: Acta Crystallographica Section E: Structure Reports Online. 2007 ; Vol. 63, No. 2.
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AB - This study presents the first structural report of a natural cobaltaustinite sample (calcium cobalt arsenate hydroxide) based on single-crystal X-ray diffraction data. Cobaltaustinite, with the ideal formula CaCo(AsO4)(OH), belongs to the adelite mineral group. The CoO 6 octahedra share edges to form chains extending parallel to the c axis, which are cross-linked by Ca2+ ions and by sharing vertices with isolated AsO4 tetrahedra. The Ca2+ ions are situated in square antiprisms formed by eight O atoms. The major structural difference between the five calcium arsenates in the adelite group is shown in the bonding environments around the octahedrally coordinated M2+ cations (M = Cu, Zn, Co, Ni and Mg), with the average M-O distance decreasing from Cu-O in conichalcite, CaCu(AsO4)(OH) to Zn-O in austinite, CaZn(AsO 4)(OH), Co-O in cobaltaustinite, Ni-O in nickelaustinite, CaNi(AsO4)(OH), and Mg-O in adelite, CaMg(AsO4)(OH). The donor-acceptor O-H⋯O distance [2.721 (7) Å] in cobaltaustinite is similar to those in austinite and nickelaustinite, but different from those in adelite and conichalcite.

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