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200th Anniversary Meeting of the Russian Mineralogical Society
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About unusial fluoride-silicate isomorphism in cuspidine: Ca4(Si2O7)F2 → Ca4(F6)F2 → Ca3□(F4)F2

RMS-DPI code:  2017-1-20-0
Scientific session:  2. Mineralogical crystallography and crystal chemistry.
Author listing:  Bakakin V.V., Kononov O.V., Koshljakova N.N.
Principal author:  Bakakin Vladimir Vasilievich
Language:  Russian
Abstract - Summary 
(short description):
Cuspidine, Ca4(Si2O7)F2, is a Ca-member of wehlerite group with a wide cation and (F,O) anion isomorphism. Samples from Tyrnyauz (Kabardino-Balkaria, Russia) are characterized by an abundance of FЦ which correlated with Si and Ca deficit. The structure of cuspidine is considered in an aspect of cation 3D network representation. A possibility of exchange of (Si2O7)6Ц → (F6)6Ц and |Ca(Si2O7)|4Ц → |□(F4)|4Ц is suggested.

Cuspidine, cation 3D networks, anion isomorphism
 
Date of presentation:  11/10/2017
Presentation Place:  √орный университет, ћалый јктовый зал
 
RMS-DPI code:  2017-1-20-0
Pages:  3-5
File of proceedings 
(PDF): 
 229 K
Status:  printed
Revised:  15/09/2017
Accepted:  15/09/2017
Contact author(s):  Bakakin, Vladimir Vasilievich
 

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