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Science 29 January 1971:
Vol. 171. no. 3969, pp. 377 - 379
DOI: 10.1126/science.171.3969.377
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Articles

Ammonioborite: New Borate Polyion and Its Structure

Stefano Merlino 1 and Franco Sartori 1

1 Istituto di Mineralogia e Petrografia, Via Santa Maria 53, 56100 Pisa, Italy

The mineral ammonioborite is monoclinic with unit cell dimensions (in angstroms): a = 25.27, b = 9.65, and c = 11.56; beta = 94°17', and the space group is C 2/c. Analysis of the crystal structure revealed the crystallo-chemical formula (NH4)3B15O20(OH)8·4H2O, with four such formula units in the unit cell. The basic structural unit is the double ring consisting of one BO4 tetrahedron and four BO3 triangles: in ammonioborite three of these units are connected to give trimeric ions [B15O20(OH)8]3-.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
A BOND-VALENCE APPROACH TO THE STRUCTURE, CHEMISTRY AND PARAGENESIS OF HYDROXY-HYDRATED OXYSALT MINERALS. II. CRYSTAL STRUCTURE AND CHEMICAL COMPOSITION OF BORATE MINERALS.
M. Schindler and F. C. Hawthorne (2001)
Can Mineral 39, 1243-1256
   Abstract »    Full Text »    PDF »
A BOND-VALENCE APPROACH TO THE STRUCTURE, CHEMISTRY AND PARAGENESIS OF HYDROXY-HYDRATED OXYSALT MINERALS. III. PARAGENESIS OF BORATE MINERALS.
M. Schindler and F. C. Hawthorne (2001)
Can Mineral 39, 1257-1274
   Abstract »    Full Text »    PDF »


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