Russian Mineralogical Society
2nd International Conference "Crystallogenesis and Mineralogy"
Peprossiite is a natural prototype of rare-earth aluminium dimetaborates

RMS-DPI code:  2007-1-51-0
Scientific session:  Session 3. Synthesis of crystalline materials and experimental mineralogy
Author listing:  Koporulina E.V., Leonyuk N.I.
Principal author:  Koporulina Elizaveta Vladimirovna
Language:  Russian
Abstract - Summary 
(short description):
Peprossiite-(Ce) and REAl-metaborate (RE = La-Nd) crystals have hexagonal plate-like habit as a result of two-dimensional crystal structure built of layered type of BO4-polyanion. Their space groups and lattice constants are similar. However, the genesis suggested is quite different. It was described as a secondary mineral with temperature region of 550-100oC and pressure of 1kbar. At the other hand, synthetic REAl-metaborates crystallize at about 1000oC under ambient pressure. For example, single crystals of (Ce,La)Al representative were grown form high-temperature solutions in the range of 1030-900oC. In contrast to earlier publications, recent IR spectroscopy investigations indicate that minor number of boron triangles also exists in their structures, both natural and synthetic.
 
RMS-DPI code:  2007-1-51-0
Proceeedings volume 
in the RMS catalogue:
 
Crystallogenesis and Mineralogy
Pages:  94-96
File of proceedings 
(PDF): 
 403 K
Status:  printed
Accepted:  28/05/2007
Published on-line:  05/01/2008
Permanent address of publication:  http://www.minsoc.ru/2007-1-51-0/
Contact author(s):  Koporulina, Elizaveta Vladimirovna

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