Quick
Search: 		  
advanced search
 GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help 
The Canadian Mineralogist Email Content Delivery
JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
The Canadian Mineralogist; December 1994; v. 32; no. 4; p. 885-894
© 1994 Mineralogical Association of Canada
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Burns, P. C.
Right arrow Articles by Hawthorne, F. C.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

Kaliborite; an example of a crystallographically symmetrical hydrogen bond

Peter C. Burns, and Frank C. Hawthorne

University of Manitoba, Department of Geological Sciences, Winnipeg, MB, Canada

The crystal structure of kaliborite, KMg 2 H[B 6 O 8 (OH) 5 ] 2 (H 2 O) 4 , monoclinic, a 18.572(6), b 8.466(3), c 14.689(5) Aa, alpha 100.02(3) degrees , V 2274(1) A degrees 3 , Z = 4, space group C2/c, has been refined by full-matrix least-squares methods to an R index of 4.4% and a wR index of 4.7% for 2403 unique observed [F> or =5sigma (F)] reflections measured with MoKalpha X-radiation. The kaliborite structure contains a 6:(2Delta +3T)+Delta fundamental building block (FBB). Each FBB contains a pentaborate (2Delta +3T) unit composed of two three-membered (1Delta +2T) rings and an additional triangle that is attached to the pentaborate unit. The borate FBBs polymerize, forming zigzag chains along b. The Mg cation is in octahedral coordination, and linked to an adjacent borate chain. The heteropolyhedral chains are joined through the K atoms, which are in a distorted cubic coordination, and via hydrogen bonds. Nine of the ten hydrogen atoms provide bonding between the heteropolyhedral chains, the other hydrogen atom links anions of the same heteropolyhedral chain. Kaliborite is one of two borate minerals that are known to contain a crystallographically symmetrical hydrogen bond.

This record provided courtesy of AGI/GeoRef.




This article has been cited by other articles:


Home page
 Can MineralHome page
M. Schindler and F. C. Hawthorne
A BOND-VALENCE APPROACH TO THE STRUCTURE, CHEMISTRY AND PARAGENESIS OF HYDROXY-HYDRATED OXYSALT MINERALS. II. CRYSTAL STRUCTURE AND CHEMICAL COMPOSITION OF BORATE MINERALS
Can Mineral, October 1, 2001; 39(5): 1243 - 1256.
[Abstract] [Full Text] [PDF]

Home page
 Can MineralHome page
M. Schindler and F. C. Hawthorne
A BOND-VALENCE APPROACH TO THE STRUCTURE, CHEMISTRY AND PARAGENESIS OF HYDROXY-HYDRATED OXYSALT MINERALS. III. PARAGENESIS OF BORATE MINERALS
Can Mineral, October 1, 2001; 39(5): 1257 - 1274.
[Abstract] [Full Text] [PDF]

Home page
 Can MineralHome page
C. L. Cahill, S. V. Krivovichev, P. C. Burns, G. K. Bekenova, and T. A. Shabanova
THE CRYSTAL STRUCTURE OF MITRYAEVAITE, Al5(PO4)2[(P,S)O3(OH,O)]2F2(OH)2(H2O)8{middle dot}6.48H2O, DETERMINED FROM A MICROCRYSTAL USING SYNCHROTRON RADIATION
Can Mineral, February 1, 2001; 39(1): 179 - 186.
[Abstract] [Full Text] [PDF]


JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2010 by Mineralogical Association of Canada